Stable-only: Pin semantic_puppet in CentOS 8

semantic_puppet >= 1.1.0 requires ruby >= 2.7.0 so can no longer be
installed in ruby 2.6.0 in CentOS 8.

Backport note:
This backport removes the version check, because we run no tests in
CentOS 9 in this branch. In addition, distro check is also removed,
because the same pin is required in Ubuntu Bionic

Also, this backport includes the following two changes present in
victoria and later.
 - Clean r10k installation
   I16436d23a7853afe029920b3ea2f61058c133010
 - Stable-only: Pin ruby packages in CentOS 8
   I1b5ebe109b7d0647f324e84b465ed4960f8749f1

Closes-Bug: #2016056
Change-Id: Iadff3de808a012c42c2c9a7edb24385c64c7ae78
(cherry picked from commit e3ababb649)
(cherry picked from commit e3ababb649)
(cherry picked from commit 3f6b89c64b)
(cherry picked from commit 2995e953f4)

install_modules.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 
 set -ex
-
+source /etc/os-release
+export OS_NAME_VERS=${ID}${VERSION_ID}
 GEM_INSTALL_CMD="gem install --no-user-install --minimal-dep --verbose --no-document"
 
 if [ -n "${GEM_HOME}" ]; then
@@ -27,14 +28,18 @@ source $SCRIPT_DIR/functions
 
 print_header 'Start (install_modules.sh)'
 print_header 'Install r10k'
-# fast_gettext 1.2.0+ requires ruby 2.1.0
-$GEM_INSTALL_CMD fast_gettext -v '< 1.2.0'
-# gettext 3.3.0+ requires ruby 2.5.0
-$GEM_INSTALL_CMD gettext -v '< 3.3.0'
-# puppet_forge 2.2.7 has a dependency on semantic_puppet ~> 1.0
-# which is not compatible with dependency of latest r10k on semantic_puppet ~> 0.1.0
-$GEM_INSTALL_CMD puppet_forge -v '= 2.2.6'
-$GEM_INSTALL_CMD r10k -v 2.6.4
+
+# faraday-net_http >= 3.0.0 requires Ruby >= 2.6.0
+# semantic_puppet >= 1.1.0 requires Ruby >= 2.7.0
+cat <<EOF >/tmp/Gemfile
+source 'http://rubygems.org'
+
+gem 'faraday-net_http', '<3.0.0'
+gem 'faraday', '<2.0.0'
+gem 'semantic_puppet', '<1.1.0'
+gem 'r10k', '<3.15.0'
+EOF
+$GEM_INSTALL_CMD -g /tmp/Gemfile
 
 # make sure there is no puppet module pre-installed
 rm -rf "${PUPPETFILE_DIR:?}/"*