CBQE-0: fix calling extract_remote_info in execute_command

it will reduce the extra ssh calls

Change-Id: I099ff580885a6284895b80db3df398208ddf396b
Reviewed-on: http://review.couchbase.org/33239
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>