Tune interval for node provision state check

By default node_provision_state is checked each 1 second.
It may cause test to fail while actual test result is success due to
testr bug #1382579
Also it creates additional load on service and increase execution
time for test.
This patch set interval to 30 sec.
It should speed up the test on overloaded nodes.

Related-Bug: #1382579
Change-Id: I631b0ee5fd8ff7c1d655b52496cf920d088c253d
1 file changed