Be more inclusive in insecure registry regex
Be more inclusive in insecure registry regex

The regex failed to match the INSECURE_REGISTRY string used in latest
atomic host image due to it expecting a whitespace after
--insecure-registry.

Change-Id: Ib8f288d844b4d94b0f6309bfd04bb05930d8c4c5

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates