rewrite call and foreach

before:
% ./run_integration_test.rb android
tar -xzf ../android.tgz
Running make for android... 6.05 secs
Running kati for android... 64.08 secs
android: OK

PASS!

after:
% ./run_integration_test.rb android
tar -xzf ../android.tgz
Running make for android... 5.76 secs
Running kati for android... 41.54 secs
android: OK

PASS!
3 files changed