Tests for both scheduler hints e.g. same_host and different_host are
added and guarded by multiple backends check. Default version updated to
2.65.
Depends-on: Ic42d8a0c1d22e77ae64e0ca014607b28fd336467
Partially implements: bp/affinity-antiaffinity-filter
Change-Id: If9c123363d71ac6bc89e743efe4dc2a00299cf5a
