CBQE:0 Fix pause-resume p0 failures, remove unwanted upgrade(3.0.0-old version to 3.0.0 -new, old builds not preserved), for reboot tests, reduce item count so loader does not time out waiting for node to come up

Change-Id: Ifa118133dbc327b8bea359ed3c89494dfee8bfea
Reviewed-on: http://review.couchbase.org/39650
Reviewed-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>