qa/suites/crimson-rados: enable watchdog in rados_api_tests

This commit enables watchdog in the workunit that runs rados_api_tests
in the crimson-rados teuthology test suite.

This is done such that if an OSD aborts and doesn't recover within the
watchdog confirgured timeout (here: 300s), we can abort the test at that
point, instead of continuing to run the rados_api_tests with their 5400s
timeout per test.

In case the tests fail and a daemon aborts, the tests now complete
within 30 mins instead of running for 3 hours.

Signed-off-by: Shraddha Agrawal <shraddha.agrawal000@gmail.com>