Droidium does not figure out AVD is broken

Current AVD name parsing is broken, it won't figure out that AVD is actually broken - for instance metadata point to AVD images that are no longer on filesystem. Even in such situations Drodium starts emulator, which is deemed to fail and Droidium waits up to all timeout to fail the test.

Ideally, Droidium should handle such situation and figure out that metadata of broken device should be deleted if user requested that AVD by name.