Increase read properties timeout in state.py
Increase read properties timeout in state.py

    - Timeouts have occured in simulation firmware testing.  Increase
      timeout from 10 to 30 seconds to fix the problem.

Signed-off-by: David Shaw <91f9aee31e37ea7a22b7df7f22d5cbf83cd27518@us.ibm.com>
Change-Id: Ib4ebf18ac9b10002212ddef5fbd6019603fe3182

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation