Update the configuration docs for the revocation extension

There was a formatting error in how step 1 appeared, and I also
changed the title to the more formal name instead of OS-REVOKE,
as the other extensions did not use their OS-* name.

Change-Id: I658ac8dc61d6a8cdacb243a10d853cf9f6aa9409
Avoid loading a ref from SQL to delete the ref

In the mapping_backend there is no need to load the ref just to
issue a delete, it can be handled as a single SQL query.

Change-Id: I4cec4fe5de4530d8da79e3be10e2d8fe431ed1f1
Sync with oslo-incubator

This syncs keystone with oslo-incubator commit hash
5fa2dae429a9e37dfd1a527eb3957cea57a3e8c4

Commits since last sync (e9bb0b59):
-----------------------------------
0506d17 cfgfilter has graduated, remove it
e5c78bb log: make set_defaults() tests clean up properly
05ae498 Add JUNO as a target to versionutils module
569979a Fix tests.unit.reports.test_base_report with python3.4
e184dd3 Fix exception message in openstack.common.processutils.execute
3d90045 Backport code for i18n to check lazy at runtime
43b0df3 Updated from global requirements
ef37e03 Added missing jsonutils.dump() function
5fd77eb Ability to customize default_log_levels for each project
4d9328c Python 3: enable tests/unit/test_log.py
b8db732 Delete 'deprecated' directory
a44ad7b Allow test_lockutils to run in isolation
8b5bc62 Allow test_service to run in isolation
80284aa Mark gettextutils obsolete
d6b55fb Remove `processutils` dependency on `log`
cb5a804 Move `mask_password` to strutils
9502a21 Use the standard python logging in network_utils
3310d8d update new requests logger to default WARN
e377393 Changes calcuation of variable delay
ab5d5f1 Use timestamp in loopingcall
5c68515 Updated from global requirements
011fc27 Python 3: replace "im_self" by "__self__"
5c11c4d Don't import fcntl on Windows
33afb20 Fix broken formatting of processutils.execute log statement
6751b30 Remove extra whitespace

Change-Id: I853469f1fb5f5274ef52caaeb2d12b3164433697
Related-BP: non-persistent-tokens
Merge "Avoid loading a ref from SQL to delete the ref"
Merge "Sync with oslo-incubator"
Merge "Update the configuration docs for the revocation extension"