Description:
===========
WL#14071 was one phase of worklogs that added support for running
queries through the hypergraph optimizer. To make sure there are
no regressions in this new area of code, a weekly run of default
suites has been added to pb2 with the --hypergraph MTR option.

Change-Id: Iaddf757806eda1f94b16b0dedbb28eaba2e8ad63