When creating AVDs, check ABI before prompting for hw config.

The check verifies the number of available ABIs and the presence
of the --abi option (required if 2+ ABIs).

This avoid going through all the hardware config to then get an error
because --abi is missing.

Change-Id: I64fefc73f4cb3d9a420309ad1850fa6c30f70e0d
1 file changed