Android: Search for a suitable emulator before starting a new avd

Note, that we don't know the names of the started avds, so we look
for a avd that has the same abi and apiLevel.

Task-number: QTCREATORBUG-10411
Change-Id: I5f6ff3ee0dddcf2bb8fca981ccedf437e32da677
Reviewed-by: BogDan Vatra <bogdan@kde.org>