- Removed sitebuildsettings, the deployment of this and manteinance in

- Removed sitebuildsettings, the deployment of this and manteinance in
opendaylight infra is troublesome and also the settings are isolated
that can be manually tweaked in the parent POM:
	- opendaylight/commons/opendaylight/pom.xl
	- third-party/commons/thirdparty
- Adjusted the deployment of third-party snapshots to happen in
opendaylight-snapshot nexus repo, given there is only deployment
access to that on jenkins and also because there is not reason to
distinguish it, anyway the groupID already avoid collision.

Signed-off-by: Giovanni Meo <gmeo@cisco.com>
Change-Id: Ieb20f107895dc9b186b1799de5cb84dc11c5ec7c