Add missing libxml2 packages

Change-Id: I43cbe7328c4c1ccb37ae9d4e04a577691263f182
Closes-Bug: 1808124

vars/debian.yml

@@ -20,8 +20,10 @@ cloudkitty_distro_packages:
   - git
   - python-systemd
   - python3-systemd
+  - libxml2
 
 cloudkitty_devel_distro_packages:
   - build-essential
   - git-core
   - libsystemd-dev
+  - libxml2-dev

vars/redhat.yml

@@ -16,6 +16,8 @@
 cloudkitty_distro_packages:
   - git
   - systemd-python
+  - libxml2
 
 cloudkitty_devel_distro_packages:
   - systemd-devel
+  - libxml2-devel

vars/suse.yml

@@ -16,7 +16,9 @@
 cloudkitty_distro_packages:
   - git-core
   - python-systemd
+  - libxml2
 
 cloudkitty_devel_distro_packages:
   - pkg-config
   - systemd-devel
+  - libxml2-devel