Decrease timeouts for some call performed when grabbing diag.

Because any of them being stuck results in inability to collect any
information.

Change-Id: I432b726743f02ca25d908d18b5ab516e7bd42f39
Reviewed-on: http://review.couchbase.org/33021
Reviewed-by: Artem Stemkovski <artem@couchbase.com>
Tested-by: Artem Stemkovski <artem@couchbase.com>