sync oslo db/sqlalchemy module

sync oslo db/sqlalchemy module to grab "Mark sql_connection with secret
flag" change.

fixes bug 1160680

Change-Id: Id48419624c41eea5a0f2e130d7cdbe8a8f0a9118
(cherry picked from commit 6ff9c9effe011cb7d8d5479ec8cd2f6c7f61705c)
Merge "sync oslo db/sqlalchemy module" into stable/grizzly
Remove unnecessary method argument.

The 'self' argument is unnecessary and when the the method is invoked,
cause parameters error.

Fix bug #1171376

Change-Id: I612b466a955cb8418855849119599222ba6479d3
(cherry picked from commit 588aa3625da1272a1225e01ddd0f70d02f7beac9)
Cannot boot vm if quantum plugin does not support L3 api

from quantumclient.common import exceptions as qexceptions was also
added to nova/network/quantumv2/api.py

Fixes bug 1163670

Change-Id: I8afcf2753c9cec9a0dc13f866301bd1e7b3fdde2
Merge "Remove unnecessary method argument." into stable/grizzly
Merge branch 'stable/grizzly' of https://github.com/openstack/nova into iteco
Allow subnet in requested_networks