MB-7954: execute_cbcollect_info with use_channel=True

now cbcollect hangs due to MB-7954

previously test hanged on MB-7954: RemoteConnection hangs when stop server
http://review.couchbase.org/#/c/25288/

Change-Id: I04e4882f6f4ab62db744edfda45ff4f258e6a371
Reviewed-on: http://review.couchbase.org/25536
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>