Fix up publicize_image unit test

The 'test_add_public_image_unauthorized' unit test wasn't checking
the 'publicize_image' policy as expected.

Replace it with new tests 'test_add_publicize_image_authorized' and
'test_add_publicize_image_unauthorized' which perform the check as
expected and verify both authorized and unauthorized code paths.

Fixes bug 1153670.

Change-Id: Ib095763a246df6aa16e1310f25b7a0d442229f1a
Mark password options secret

Mark password options secret in kombu and qpid notifiers.

Fixes bug 1154096

Change-Id: Ifa25ac791e2accce50eafb242f2466681f7ca457
Merge "Fix up publicize_image unit test"
Merge "Mark password options secret"