Fix assertEqual arguments order(backend_ldap, cache, v3_protection)

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

Partial-Bug: #1277104

Change-Id: I311590525bfebd3c587af6a94f6989df66dc2064
Remove "test-only" pam config options

Remove the "pam" configuration options that were only ever used for
testing purposes. Removes the test config file "backend_pam.conf"
by moving test_backend_pam.py to utilize proper configuration fixture
for identity driver. Since we no longer need the "pam.user" and
"pam.password" config options.

DocImpact

Related-Bug: #1229941
Change-Id: I3759ff7974948432900e3a73f3d87e5eed6e9828
Remove paste_deploy from test_overrides.conf

There's a default for paste_deploy, so it doesn't have to be set
in test_overrides.conf.

Change-Id: I6316eb113efbd16de91e16a3f5974005989d7dd8
Merge "Remove paste_deploy from test_overrides.conf"
Merge "Fix assertEqual arguments order(backend_ldap, cache, v3_protection)"
Merge "Remove "test-only" pam config options"