Increase test timeouts.

Increased timeouts to increase chance of
tests being successful when executed against
a loaded cluster.

Change-Id: Ifbad3cd58775576d3180a11121a4abefa9259540
Reviewed-on: http://review.couchbase.org/38732
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Brett Lawson <brett19@gmail.com>