Fix glance vars duplication in group_vars/repo_packages

* Git vars and service_pip_dependencies were duplicated
* Fixes inconsistencies when the vars aren't the same
* Remove duplicate vars from group_vars
* Ensure all vars are in repo_packages

Fixes-Bug: #240
Merge pull request #241 from andymcc/glance_vars_fix

Fix glance vars duplication in group_vars/repo_packages