KUDU-209: ts_tablet_manager-test fails sometimes in TestTabletReports
KUDU-209: ts_tablet_manager-test fails sometimes in TestTabletReports

ts_tablet_manager-test seems to have a race in the TestTabletReports
test.  The code gets a tablet report from the tablet_manager and expects
that it can know what the sequence number will be.  However, this seems
fragile, since the tablet_manager may have generated a report on its own
during this time.  So let's change it to only assert that the sequence
number is going up each time we check.

Change-Id: Idd8ef421fbcfd4b84a64f939f64793319c041f9c
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2113
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@cloudera.com>
Tested-by: jenkins
Reviewed-by: Colin McCabe <3142ce8a0bdba4a38073365893e6b74f72d9c512@cloudera.com>

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