Add RPC version to test_get_driver_properties

We should be explicit about which version is required by that RPC
call. The test works now because it needs the current last RPC version
(1.16), but any subsequent update on the RPC layer will cause that test
to fail.

Change-Id: I77d8ad8486a1ae58ed150bb08acc99b0f55792c3
Tune down node_locked_retry_{attempts,interval} config for tests

Tune down the node_locked_retry_interval and
node_locked_retry_attempts config options for tests. The commit
428c24767575419d5b472b52f2b622588a3a7253 introduced a new retry mechanism
for the NodeLocked exception but the config options weren't resetted for
the tests so the tests verifying that exception were wasting time sleeping.

Closes-Bug: #1348586
Change-Id: Ia516ede357b00ebb19d10f2f603a3e766478c1b3
Merge "Tune down node_locked_retry_{attempts,interval} config for tests"