CBQE-0: add timeout after installation in runsystest.py

Change-Id: Iaa5b239e0cda70ded9b012cbb8f136e2296a3a03
Reviewed-on: http://review.couchbase.org/43670
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>