Implements blueprint separate-nova-volumeapi

* Moves openstack/v2 directory to compute and fixes tests accordingly
 * Moves some code from api/openstack/compute to shared location, for use by volume api
 * Implements basic volume functionality for types, volumes, and snapshots
 * Changes service name from osapi to osapi_compute (and adds osapi_volume)
 * Renames nova-api-os to nova-api-os-compute, adds nove-api-os-volume
 * Separate extension mechanism for compute and volume
 ** Removes flag osapi_extension and replaces with osapi_compute_extension and osapi_volume_extension
 * Updates the paste config
 * Fixes setup.py to include nova-os-api-compute and nova-os-api-volume
 * Fix bug in volume version code that occurred as result of trunk merge
 * Update integrated/test_volumes.py to use new endpoint

Change-Id: I4c2e57c3cafd4e1a9e2ff3ce201c8cf28326afcd

setup.py

@@ -87,7 +87,8 @@ setup(name='nova',
                'bin/nova-api',
                'bin/nova-api-ec2',
                'bin/nova-api-metadata',
-               'bin/nova-api-os',
+               'bin/nova-api-os-compute',
+               'bin/nova-api-os-volume',
                'bin/nova-compute',
                'bin/nova-console',
                'bin/nova-dhcpbridge',