Don't wait forever while getting system properties

Obtaining system properties from the device should normally
complete quickly (and many read only properties are then cached).

However, a few convenience methods were obtaining these system
properties without any timeouts, which could cause the EDT to
block if the device is not responding. This CL updates those
methods to use the API that times out after a certain interval.

Change-Id: Ic7ccadb240f2981868d135a64905ab25fc9181c4
1 file changed