Use consul_kv_fail instead of consul_kv_blocker

Blocker blocks all puppet execution once it is executed (not only dependant resources)
until the dependancy available. So better just fail all dependant resources
rather than blocks unncessary resources.

As a POC, just using fail for neutron floating IP before creating contrail vgw.

This one is depends on PR jiocloud/puppet-orchestration_utils#3