Merge "Improve error message for GetMinSdkVersion" am: a88313f6

  stdoutdata, stderrdata = proc.communicate()

  if proc.returncode != 0:

    raise ExternalError(

        "Failed to obtain minSdkVersion: aapt2 return code {}:\n{}\n{}".format(

            proc.returncode, stdoutdata, stderrdata))

        "Failed to obtain minSdkVersion for {}: aapt2 return code {}:\n{}\n{}".format(

            apk_name, proc.returncode, stdoutdata, stderrdata))

  for line in stdoutdata.split("\n"):

    # Looking for lines such as sdkVersion:'23' or sdkVersion:'M'.