[client-test] fixing flakes in the test
[client-test] fixing flakes in the test

Extended timeout for table creation up to 60 seconds in couple of places
where dist-test reports intermittent timeouts.

Added print-out of the session errors if the actual number of session
errors differs from the expected one
(that's for TestAutoFlushBackgroundAndErrorCollector)

Change-Id: Ic0203e62ec8ee445201e385816f3c05c2594356d
Reviewed-on: http://gerrit.cloudera.org:8080/7263
Tested-by: Kudu Jenkins
Reviewed-by: Adar Dembo <866ca730bfc7f544e3ebce604ceeba4879f23df0@cloudera.com>

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