Fix assertEqual arguments order(_ldap_tls_livetest, backend_kvs, etc)

assertEqual method's arguments should be in
('expected', 'actual') order.

Partial-Bug: #1277104

Change-Id: I48d2220ebd39d72de071a4644b75182941bb5f4f
Replace assertEqual(None, *) with assertIsNone in tests

Replace assertEqual(None, *) with assertIsNone in keystone's tests
to havemore clear messages in case of failure.

Closes-Bug: #1280522
Change-Id: I5a857fcb3bfebc6ff14871df6b2cd1dee44596b2
Remove unused variable

o keystone/common/wsgi.py:_RE_PASS
  = re.compile(r'([\'"].*?password[\'"]\s*:\s*u?[\'"]).*?([\'"])',

  This variable was removed in the following commit.

    commit d910f1ff593dbd66f5643901142f390d0de73bdc
    Author: Brant Knudson <bknudson@us.ibm.com>
    Date:   Mon Dec 16 19:49:52 2013 -0600

        Switch to oslo-incubator mask_password

Change-Id: I6236bdb34cfcddcb338bb066450f4e89c5447e24
Merge "Replace assertEqual(None, *) with assertIsNone in tests"
Merge "Remove unused variable"
Merge "Fix assertEqual arguments order(_ldap_tls_livetest, backend_kvs, etc)"