qa: add snaptest-estale.sh
qa: add snaptest-estale.sh

Verify requests withing snapped namespace are directed to the proper
MDS.  We should never get ESTALE, only ENOENT.

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph