Fix database upgrade from 4.3.0 to 4.4.0
region level VPC support

introduce 'RegionLevelVpc' as capability of 'Connectivity' service. Add
support for CreateVPCOffering to take the 'regionlevelvpc' as capability
of service 'connectivity'.

introduces new capability 'StretchedL2Subnet' for 'Connectivity'
service. Also add support to createNetworkOffering api to allow
StretchedL2Subnet capablity for the connectivity service.

adds check to ensure 'Connectivity' service provider supports
'StretchedL2Subnet' and 'RegionLevelVpc' capabilities when specified in
createNetworkOffering and createVpcOffering respectivley

enable ovs plug-in to support both StretchedL2Subnet and RegionLevelVpc
capabilities

make zone id optional parameter in createVpc, zone id can be null only
if vpc offfering supports region level VPC

in region level vpc, let the network/tier to be created in any zone of
the region

keep zoneid as required param for createVpc

skip external guest network guru if 'Connectivy' service is present in
network offering

fix build break in contrail manager

permit VM's to be created in different zone that in which network is
created if the network support streched L2 subnet

add integration tests for region level VPC

rebase to master

Conflicts:
	setup/db/db/schema-430to440.sql
fix schema issue