CBQE-0: logging ip in execute_command_raw

Change-Id: I75b7cfee129046224285a3832b0b418419056a15
Reviewed-on: http://review.couchbase.org/26309
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>