Resolves lookup plugin name duplication issue
Resolves lookup plugin name duplication issue

The `playbooks/plugins/lookups/py_pkgs.py` had an issue where it's
assumed that the name of a package is always split on an "_" however
a repo name could be anything before the `_git_repo` portion. This
commit corrects that issue.

Change-Id: I49f8a7726ed99e47ff514cdf6e61472fac5b9ed4
Partially-Implements: blueprint master-kilofication

bunchc/openstack-ansible,cfarquhar/openstack-ansible,mrda/openstack-ansible,BjoernT/openstack-ansible,pombredanne/os-ansible-deployment,cloudnull/os-ansible-deployment,jpmontez/os-ansible-deployment,open-switch/infra_openstack-ansible,miguelgrinberg/os-ansible-deployment,achekunov/openstack-ansible,shane-c/openstack-ansible,mancdaz/openstack-ansible,AlphaStaxLLC/os-ansible-deployment,major/os-ansible-deployment,sigmavirus24/os-ansible-deployment,openstack/openstack-ansible,yanyao/openstack-ansible,git-harry/os-ansible-deployment,yanyao/openstack-deployment-liberty,pombredanne/os-ansible-deployment,jpmontez/os-ansible-deployment,os-cloud/os-ansible-deployment,git-harry/os-ansible-deployment,Logan2211/openstack-ansible,yanyao/newton,dhanunjaya/os-ansible-deployment,shane-c/openstack-ansible,sacharya/os-ansible-deployment,robb-romans/openstack-ansible,os-cloud/os-ansible-deployment,jpmontez/openstack-ansible,sti-jans/openstack-ansible,robb-romans/openstack-ansible,weezer/openstack-ansible,miguelgrinberg/os-ansible-deployment,d34dh0r53/os-ansible-deployment,openstack/openstack-ansible,cfarquhar/openstack-ansible,jpmontez/openstack-ansible,yanyao/openstack-deployment-liberty,yanyao/newton,achekunov/openstack-ansible,sigmavirus24/os-ansible-deployment,sti-jans/openstack-ansible,jpmontez/os-ansible-deployment,open-switch/infra_openstack-ansible,mrda/openstack-ansible,sigmavirus24/openstack-ansible,manuelfelipe/openstack-ansible,bunchc/openstack-ansible,achekunov/openstack-ansible,open-switch/infra_openstack-ansible,major/openstack-ansible,stackforge/os-ansible-deployment,BjoernT/openstack-ansible,pombredanne/os-ansible-deployment,git-harry/os-ansible-deployment,sti-jans/openstack-ansible,AlphaStaxLLC/os-ansible-deployment,yanyao/openstack-deployment-liberty,jpmontez/openstack-ansible,d34dh0r53/os-ansible-deployment,manuelfelipe/openstack-ansible,manuelfelipe/openstack-ansible,BjoernT/os-ansible-deployment,major/openstack-ansible,stackforge/os-ansible-deployment,dhanunjaya/os-ansible-deployment,mancdaz/openstack-ansible,antonym/openstack-ansible,mrda/openstack-ansible,sacharya/os-ansible-deployment,shane-c/openstack-ansible,major/os-ansible-deployment,antonym/openstack-ansible,sigmavirus24/openstack-ansible,antonym/openstack-ansible,BjoernT/os-ansible-deployment,AlphaStaxLLC/os-ansible-deployment,cloudnull/os-ansible-deployment,wenhuizhang/os-ansible-deployment,wenhuizhang/os-ansible-deployment,metral/os-ansible-deployment,weezer/openstack-ansible,metral/os-ansible-deployment,yanyao/openstack-ansible,BjoernT/os-ansible-deployment,Logan2211/openstack-ansible