AIDEGen: Check if the Android SDK path is correct

Parsing the source.properties file under the platform folder to check if
the API level exists. If successfully get the API level, the path is a
correct Android SDK folder.

Bug: 150255891
Test: sh run_tests.sh
Change-Id: Ie8180fc93a424d4ae2d6bde5a1884712fb012e9b
2 files changed