Sync against taskchampion-sync-server (#3118)

This removes use of gnutls and the TLS implementation, which is no
longer needed (task synchronization is handled via Taskchampion, which
uses `reqwest`, which handles TLS via other Rust dependencies). This
incidentally removes the following config options:
 * `debug.tls`
 * `taskd.ca`
 * `taskd.certificate`
 * `taskd.ciphers`
 * `taskd.credentials`
 * `taskd.key`
 * `taskd.server`
 * `taskd.trust`

test/docker/arch

@@ -2,7 +2,7 @@ FROM archlinux/archlinux:base-devel
 
 RUN pacman -Sy --noconfirm archlinux-keyring
 RUN pacman -Syyu --noconfirm
-RUN pacman -S --noconfirm gnutls util-linux bash-completion cmake python3 git libfaketime curl
+RUN pacman -S --noconfirm util-linux bash-completion cmake python3 git libfaketime curl
 
 # Setup language environment
 ENV LANG en_US.UTF-8

test/docker/centos7

@@ -1,7 +1,7 @@
 FROM centos:7
 
 RUN yum update -y
-RUN yum install python3 git gcc gcc-c++ make gnutls-devel libuuid-devel -y
+RUN yum install python3 git gcc gcc-c++ make libuuid-devel -y
 RUN yum install epel-release centos-release-scl -y
 RUN yum install which cmake3 devtoolset-7-gcc* libfaketime curl -y
 RUN source scl_source enable devtoolset-7; gcc --version; cmake3 --version

test/docker/centos8

@@ -5,7 +5,7 @@ RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-*
 RUN sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-Linux-*
 
 RUN dnf update -y
-RUN dnf install python3 git gcc gcc-c++ make gnutls-devel libuuid-devel glibc-langpack-en -y
+RUN dnf install python3 git gcc gcc-c++ make libuuid-devel glibc-langpack-en -y
 RUN dnf install epel-release -y
 RUN dnf install which cmake libfaketime curl -y
 RUN gcc --version; cmake --version

test/docker/debianstable

@@ -1,7 +1,7 @@
 FROM debian:stable
 
 RUN apt-get update
-RUN apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev faketime
+RUN apt-get install -y build-essential cmake git uuid-dev faketime
 RUN apt-get install -y python3 curl
 
 # Setup language environment

test/docker/debiantesting

@@ -1,7 +1,7 @@
 FROM debian:testing
 
 RUN apt-get update
-RUN apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev faketime
+RUN apt-get install -y build-essential cmake git uuid-dev faketime
 RUN apt-get install -y python3 curl
 
 # Setup language environment

test/docker/fedora32

@@ -1,7 +1,7 @@
 FROM fedora:32
 
 RUN dnf update -y
-RUN dnf install python3 git gcc gcc-c++ cmake make gnutls-devel libuuid-devel libfaketime glibc-langpack-en curl -y
+RUN dnf install python3 git gcc gcc-c++ cmake make libuuid-devel libfaketime glibc-langpack-en curl -y
 
 # Setup language environment
 ENV LC_ALL en_US.UTF-8

test/docker/fedora33

@@ -1,7 +1,7 @@
 FROM fedora:33
 
 RUN dnf update -y
-RUN dnf install python3 git gcc gcc-c++ cmake make gnutls-devel libuuid-devel libfaketime glibc-langpack-en curl -y
+RUN dnf install python3 git gcc gcc-c++ cmake make libuuid-devel libfaketime glibc-langpack-en curl -y
 
 # Setup language environment
 ENV LC_ALL en_US.UTF-8

test/docker/fedora34

@@ -1,7 +1,7 @@
 FROM fedora:34
 
 RUN dnf update -y
-RUN dnf install python3 git gcc gcc-c++ cmake make gnutls-devel libuuid-devel libfaketime glibc-langpack-en curl -y
+RUN dnf install python3 git gcc gcc-c++ cmake make libuuid-devel libfaketime glibc-langpack-en curl -y
 
 # Setup language environment
 ENV LC_ALL en_US.UTF-8

test/docker/fedora35

@@ -1,7 +1,7 @@
 FROM fedora:35
 
 RUN dnf update -y
-RUN dnf install python3 git gcc gcc-c++ cmake make gnutls-devel libuuid-devel libfaketime glibc-langpack-en curl -y
+RUN dnf install python3 git gcc gcc-c++ cmake make libuuid-devel libfaketime glibc-langpack-en curl -y
 
 # Setup language environment
 ENV LC_ALL en_US.UTF-8

test/docker/gentoo

@@ -7,7 +7,7 @@ FROM gentoo/stage3-x86:latest
 # copy the entire portage volume in
 COPY --from=portage /usr/portage /usr/portage
 
-RUN emerge -qv sys-libs/readline:0 net-libs/gnutls:0= sys-apps/util-linux dev-util/cmake sys-devel/make dev-vcs/git sys-libs/libfaketime net-misc/curl
+RUN emerge -qv sys-libs/readline:0 sys-apps/util-linux dev-util/cmake sys-devel/make dev-vcs/git sys-libs/libfaketime net-misc/curl
 
 # Setup language environment
 ENV LC_ALL en_US.UTF-8

test/docker/opensuse15

@@ -1,6 +1,6 @@
 FROM opensuse/leap:15
 
-RUN zypper install -y python3 awk coreutils git gcc gcc-c++ cmake make libgnutls-devel libuuid-devel libfaketime curl
+RUN zypper install -y python3 awk coreutils git gcc gcc-c++ cmake make libuuid-devel libfaketime curl
 
 # Setup language environment
 ENV LC_ALL en_US.UTF-8

test/docker/ubuntu1604

@@ -1,7 +1,7 @@
 FROM ubuntu:16.04
 
 RUN apt-get update
-RUN apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev faketime locales python3 curl
+RUN apt-get install -y build-essential cmake git uuid-dev faketime locales python3 curl
 
 # Setup language environment
 RUN locale-gen en_US.UTF-8

test/docker/ubuntu1804

@@ -1,7 +1,7 @@
 FROM ubuntu:18.04
 
 RUN apt-get update
-RUN apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev faketime locales python3 curl
+RUN apt-get install -y build-essential cmake git uuid-dev faketime locales python3 curl
 
 # Setup language environment
 RUN locale-gen en_US.UTF-8

test/docker/ubuntu2004

@@ -1,7 +1,7 @@
 FROM ubuntu:20.04
 
 RUN apt-get update
-RUN DEBIAN_FRONTEND="noninteractive" apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev faketime locales python3 curl
+RUN DEBIAN_FRONTEND="noninteractive" apt-get install -y build-essential cmake git uuid-dev faketime locales python3 curl
 
 # Setup language environment
 RUN locale-gen en_US.UTF-8

test/docker/ubuntu2204

@@ -1,7 +1,7 @@
 FROM ubuntu:22.04
 
 RUN apt-get update
-RUN DEBIAN_FRONTEND="noninteractive" apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev faketime locales python3 curl
+RUN DEBIAN_FRONTEND="noninteractive" apt-get install -y build-essential cmake git uuid-dev faketime locales python3 curl
 
 # Setup language environment
 RUN locale-gen en_US.UTF-8