Add additional options for testrunner script

Added options as follows:
 -v, verbose output
 -c, couchstore_install_path

Change-Id: I242bf6f1d07ef208483d9f5553e5ccdafdf8c21b
Reviewed-on: http://review.couchbase.org/34570
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>