Filter pre_release versions of packages
Filter pre_release versions of packages

Get-pypi-pkg-version should not return pre release versions. This comit
filters them out with a simple regex.

Change-Id: I3919fc1a9872250acc100e751f4b78cc857b3348

yanyao/newton,stackforge/os-ansible-deployment,openstack/openstack-ansible,weezer/openstack-ansible,cloudnull/os-ansible-deployment,BjoernT/os-ansible-deployment,bunchc/openstack-ansible,os-cloud/os-ansible-deployment,cfarquhar/openstack-ansible,bunchc/openstack-ansible,weezer/openstack-ansible,BjoernT/openstack-ansible,cfarquhar/openstack-ansible,Logan2211/openstack-ansible,stackforge/os-ansible-deployment,cloudnull/os-ansible-deployment,Logan2211/openstack-ansible,yanyao/newton,robb-romans/openstack-ansible,BjoernT/os-ansible-deployment,os-cloud/os-ansible-deployment,yanyao/openstack-ansible,openstack/openstack-ansible,BjoernT/os-ansible-deployment,BjoernT/openstack-ansible,robb-romans/openstack-ansible,yanyao/openstack-ansible