Remove duplicated config doc

Remove the list of config options from configuration.rst and add
reference to the OS Manuals Configuration Reference, which is the proper
place for this information. With this change the duplication of docco
is also removed.

Latest Config Reference update patch:
https://review.openstack.org/#/c/132997/

Closes-Bug: #1380605
Change-Id: I6293d2e92bdb3dcf8fbadf5d33d63cf38342c528
Add bandwidth to measurements

Bandwidth notification has been implemented since Icehouse, but
never presents in documents.

Change-Id: Icc187841d8664c48151482259d5b717580115950
Closes-Bug: #1391040
Merge "Remove duplicated config doc"
Merge "Add bandwidth to measurements"