fix unit tests
fix unit tests

With the introduction of [1] into neutron, the revision number of a
created router is now 1 and not 0. The dragonflow code is expecting 0
today and thus 3 unit tests fail due to this.

This patch updates to the tests to expect the revision number to be 1
rather than 0 as per [1].

[1] https://review.openstack.org/#/c/635671/

Change-Id: I8d16fada6972854719d9023dd79915820a73ff3b

openstack/dragonflow,openstack/dragonflow,openstack/dragonflow