ansible-role-requirements: Switch ODL git repo to the github mirror
ansible-role-requirements: Switch ODL git repo to the github mirror

Cloning from the official ODL git repository fails far too often with
the following error

fatal: unable to access 'https://git.opendaylight.org/gerrit/p/integration/packaging/ansible-opendaylight.git/': gnutls_handshake() failed: Error in the pull function

Lets switch to the github mirror which may be more reliable.

Change-Id: Ic73d92ad0535389a301d7cdedb6b167762cb416c

bunchc/openstack-ansible,stackforge/os-ansible-deployment,stackforge/os-ansible-deployment,bunchc/openstack-ansible,openstack/openstack-ansible,cfarquhar/openstack-ansible,openstack/openstack-ansible,cfarquhar/openstack-ansible