Skip test_init_failed_processing_hook test
Skip test_init_failed_processing_hook test

https://review.openstack.org/#/c/337043/ makes this test to fail,
but proper fix in https://review.openstack.org/339457 requires
release of stevedore > 1.15.0 not released yet.

This patch skips the test temporarily until new release is added
in global requirements.

Change-Id: Id23efad9c392fc70470d996e37d378efeaf65491
Partial-Bug: #1600141

openstack/ironic-inspector,openstack/ironic-inspector