CLOUDSTACK-6968: allowing cluster scope volumes to attach to any VM. If migration is
needed then first they will be migrated to appropriate cluster before attaching.
CLOUDSTACK-6965: fixed the NullPointerException introduced by fix for cloudstack
6935 in AbstractStoragePoolAllocator#filter method for Zone Wide storage
CLOUDSTACK-6967: Initial OVM3 drop

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>
(cherry picked from commit ed47763e2525a21fa4578d199492462d0fb1c7ef)

Conflicts:
	api/src/com/cloud/network/NetworkService.java
	api/src/org/apache/cloudstack/api/ApiConstants.java
	api/src/org/apache/cloudstack/api/command/admin/usage/AddTrafficTypeCmd.java
	engine/storage/snapshot/src/org/apache/cloudstack/storage/snapshot/SnapshotObject.java
	plugins/pom.xml
	server/src/com/cloud/network/NetworkServiceImpl.java
	server/src/com/cloud/network/router/VirtualNetworkApplianceManagerImpl.java
	server/test/com/cloud/vpc/MockNetworkManagerImpl.java
	ui/scripts/docs.js
CLOUDSTACK-6967: Now with module!

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>
(cherry picked from commit 1516b041bc762535b8f2e74bcb1e6594e5657f86)