CBST-14: push_stats to cbfs fails when eventdb missing

without eventdb there is no what to detect which phases data belongs to, however since there is still data being collected we can collect everything into 1 phase as a fallback.

Change-Id: Ib345acc911148f9786a79bb9762486afead88626
Reviewed-on: http://review.couchbase.org/30527
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: Tommie McAfee <tommie@couchbase.com>