Currently it's not simple to create a matrix job which includes 2.x AVDs as well as 4.x AVDs, since the former don't require an ABI, but the latter do.

So if you enter the ABI "armeabi-v7a" in the job configuration, this will be used even when trying to generate the 2.x AVDs, which will fail. Conversely, if you don't enter an ABI, the 2.x AVDs will be generated correctly, but the 4.x ones will fail.

We should not pass the "--abi" flag to "android create avd" if the platform version doesn't support ABIs.