Change the unit test to only test if the consul link exists, not the
value of the link. The old test was hostname specific and therefore
would always be different based on the environment running the tests.
Reduce future confusion by introducing a minor version that is gossiped out
via the `mvn` Serf tag (Minor Version Number, `vsn` is already being used for
to communicate `Major Version Number`).
Background: hashicorp/consul/issues/1346#issuecomment-151663152
