CBQE-0: sys.exit if unable to initialize couchbase node

http://qa.hq.northscale.net/job/win_2012_x64--24_05--rebalance_kv-P0/17/console

Change-Id: I4cd2d62cba3031c877f600d94a7fe799087e6afd
Reviewed-on: http://review.couchbase.org/34928
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>