Moar tests for RunCommand:

- Command not found.
- Command returns non-0 status (and fixed return of RunCommand).
- Command times out.
- Command is killed.
- Command crashes.
- Command logs initial message.

BUG: 31807540
Test:  mmm -j32 frameworks/native/cmds/dumpstate/ && adb push ${ANDROID_PRODUCT_OUT}/data/nativetest/dumpstate_test* /data/nativetest && adb shell /data/nativetest/dumpstate_test/dumpstate_test
Change-Id: I6459846791e45f4ebc4433b83feec81be4050167