CBQE-0: minor fix in store_report.get_run_info

not always our phases strarted from '1' phase

Change-Id: Ib80dacf561eaf95c0bee652584e34e7717494a2a
Reviewed-on: http://review.couchbase.org/28293
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>