Set the os-ansible-deployment-lint check to only run on master branch

In order to ensure that the syntax and lint checks are only processed on
master and do not fail on older branches, the check is only being set to
run on master.

Change-Id: Iea9c2dd5e6fd112775e0fd073b93c0e842af7f27
Merge "Set the os-ansible-deployment-lint check to only run on master branch"