KUDU-172 Fix MiniCluster wait for Tablet Servers to be online
KUDU-172 Fix MiniCluster wait for Tablet Servers to be online

The WaitForTabletServerCount() was just checking the number of TS-descriptors
returned by the master, but the master may return descriptors of TS that are down.
Add a check to verify that the TSDesc returned have the same uuid/seqno that we expect.

Change-Id: If36c7ad8b0704108510a555bde59802f7f0499b6
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2109
Tested-by: jenkins
Reviewed-by: Jean-Daniel Cryans <4bf4c125525b8623ac45dfd7774cbf531df19085@cloudera.com>

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