Remove unused tenant_id variable

As discussed in [1] we can remove some unused
code.

[1] https://review.openstack.org/304032

Trivial fix

Change-Id: I54529092fc7e0988459d04fb1dcc092ac2fe92d6
1 file changed
tree: 57b3afc0f046177ecb0b359cba66bc10260910a6
  1. manila_tempest_tests/