Improve error handling when nvp and quantum are out of sync

Previouly when nvp and quantum were out of sync an exception would
be raised notifying the user of this. This patch changes the behavior so that
now when  elements are found in the quantum db but not in NVP they are
put into error state. In addition there error state elements are now able
to be deleted if not found in nvp.

This patch also removes outdated doc strings that seem to keep being adding.

Fixes bug 1127643

Change-Id: I3e79ab7a284e61623cd63fefc3755746b8e4dfd7
Update latest OSLO files

Change-Id: I17844d2bc5f8255833e8a5b3dc9412041de12826
Supporting pagination in api v2.0

Implements bp support-pagination-in-api-v2.0

Add sort and pagination feature for api v2.0.
*Add sort_key, sort_dir for sorting feature.
*Add limit, marker, page_reverse for pagination feature.
*Add emulated sorting and pagination

Native pagination and native sorting implemented for:
*plugins: ovs, linuxbridge
*extensions: l3 securitygroup

Emulated pagination and sorting enabled for:
extensions: lbaas

Change-Id: I28ec6ab7bcae9839cb42c6d60bbfff7250de13ed
Support Port Binding Extension in BigSwitch plugin

Bug #1100395

Change-Id: I7097c9f0df8742f947860098d4928d9fd328e14b
Merge "Improve error handling when nvp and quantum are out of sync"
Merge "Support Port Binding Extension in BigSwitch plugin"
Merge "Update latest OSLO files"
Merge "Supporting pagination in api v2.0"