Start 2i components during ns_server startup
Start 2i components during ns_server startup

The 2i components projector and indexer can be enabled during
node bootstrap by setting the environment variable ENABLE_2I.

Change-Id: Ic0cff242d79324ab4ba9875eb045b499f3ca1544

t3rm1n4l/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server