vars: Drop development packages

python development files are not needed on the containers since we do
not do any building on them. Moreover, git is also not used either.
Finally, sync all 3 distribution files so they all install the same
set of core packages

Change-Id: I09885e79a615db89065351c68fd8fcbc6a99958d

vars/redhat-7.yml

@@ -83,14 +83,12 @@ _lxc_cache_distro_packages:
   - ca-certificates
   - cronie
   - epel-release
-  - git
   - openssh-server
-  - python-devel
   - python2
   - rsync
   - sudo
-  - wget
   - tar
+  - wget
   - which
   - yum-plugin-priorities
   - yum-utils

vars/suse-42.yml

@@ -85,17 +85,15 @@ lxc_cache_map:
     {{ lxc_cache_prep_post_commands }}
 
 _lxc_cache_distro_packages:
-  - ca-certificates
   - ca-certificates-mozilla
-  - git-core
+  - cronie
   - openssh
-  - python-devel
   - python
   - python-xml
   - rsync
   - sudo
-  - wget
   - tar
+  - wget
   - which
 
 lxc_cached_network_interfaces:

vars/ubuntu-16.04.yml

@@ -101,14 +101,15 @@ lxc_cache_install_debconf: '-o Dpkg::Options::="--force-confdef" -o Dpkg::Option
 
 _lxc_cache_distro_packages:
   - apt-transport-https
-  - build-essential
   - ca-certificates
-  - git
-  - iptables
+  - cron # xenial doesn't have cronie
   - openssh-server
-  - python-dev
   - python2.7
   - rsync
+  - sudo
+  - tar
+  - wget
+  - debianutils # for 'which' executable
 
 lxc_cached_network_interfaces:
   - src: "lxc-net-bridge.cfg.j2"