Relax assertion in test_get_all_shards

when listing all shards, currently test expects to find only shards
that it has just created, but there could be other, pre-existing shards,
like default "None" one or shards created by other tests
running in parallel.

Instead, check that the created shards is a subset of all shards.

Change-Id: Ic35f9be232837922ae8ed857c7ea0bb58e064987
Signed-off-by: Pavlo Shchelokovskyy <shchelokovskyy@gmail.com>
1 file changed