Clean up keystone-all.rst

This change fixes warnings and errors from
doc/source/man/keystone-all.rst when generating documentation.

Change-Id: Ie33b2600f28c517644730b2371ce34ca2e73b7a5
Stop passing context to managers (bug 1194938)

We don't have a use case for passing the request context to the manager
layer, so this patch removes a bunch of cruft.

Change-Id: Ic6435782c4c9f32e38c7800172645cc1af23ea09
check for constraint before dropping

Bug 1189633

Change-Id: Ieff57d17f224ec31523bfcce288818a08d64f98a
Manager instead of direct driver

Make calls via the manager as opposed to the drivers
in order to support refactoring of common code

Bug 1193420

Change-Id: I69117ea755ed7ef3f7d3732fee83cc758927d296
Merge "check for constraint before dropping"
Merge "Clean up keystone-all.rst"
Merge "Manager instead of direct driver"