Regenerate sample config

The sample config file was out of date, so regenerated it with

 tox -e sample_config

Change-Id: Ib17ebcbc1b4c929da8ce3f1a31df33a3b798522d
Mapping engine does not handle regex properly

Currently, if there is more than one assertion value (the list of
group ids returned from the idp). Then when using regex to compare
again the mapping values, only the first values are used.

Change-Id: Iba7d455ef0d5fc2d4ac16f4a7eb553845270fb2c
Closes-Bug: #1321536
Cleanup of ldap assignment backend

Some minor changes were made.

Change-Id: I1c70f3b3cfd01d79ace3869985841c29b42357e8
install from source docs never actually install the keystone service

Change-Id: I4997f60f3c4746821e8cd8db76b1d54fe786ccfa
Closes-Bug: 1322735
Merge "Regenerate sample config"
Merge "Mapping engine does not handle regex properly"
Merge "Cleanup of ldap assignment backend"
Merge "install from source docs never actually install the keystone service"