Add rfc.sh for git review.
Add rfc.sh for git review.

Adding tools/rfc.sh which facilitates an easier git/gerrit workflow
described at http://wiki.openstack.org/GerritWorkflow

Adding it to the repository is a pre-requisite, instructions on how
to start using it will be sent to the mailing list soon.

Change-Id: I4086b7c1a9fce4283a196f3aeb00be90c30f0e2a

darren-wang/gl,ozamiatin/glance,rajalokan/glance,sigmavirus24/glance,openstack/glance,stevelle/glance,vuntz/glance,SUSE-Cloud/glance,sigmavirus24/glance,rajalokan/glance,kfwang/Glance-OVA-OVF,scripnichenko/glance,SUSE-Cloud/glance,paramite/glance,JioCloud/glance,openstack/glance,darren-wang/gl,dims/glance,citrix-openstack-build/glance,ozamiatin/glance,wkoathp/glance,scripnichenko/glance,akash1808/glance,vuntz/glance,ntt-sic/glance,takeshineshiro/glance,akash1808/glance,redhat-openstack/glance,tanglei528/glance,cloudbau/glance,rickerc/glance_audit,cloudbau/glance,takeshineshiro/glance,jumpstarter-io/glance,dims/glance,saeki-masaki/glance,rickerc/glance_audit,citrix-openstack-build/glance,JioCloud/glance,saeki-masaki/glance,wkoathp/glance,paramite/glance,jumpstarter-io/glance,tanglei528/glance,klmitch/glance,redhat-openstack/glance,ntt-sic/glance,stevelle/glance,openstack/glance,kfwang/Glance-OVA-OVF,klmitch/glance