Only publish API guides from master
Only publish API guides from master

These guides are not versioned and all publish to the same place, so do
not run them on any branches besides master.

Change-Id: Id718170c7ffda41f35e49b0ed8f4a0a8ed69e26e

Tesora/tesora-project-config,openstack-infra/project-config,Tesora/tesora-project-config,dongwenjuan/project-config,dongwenjuan/project-config,openstack-infra/project-config