am 120a58fb: Extend unit test framework for Wifi soft AP configuration Add test case: testApSsidWithAlphabet

Merge commit '120a58fb80ec9ba5b62e4b7453ea45703d1ce58a' into gingerbread-plus-aosp

* commit '120a58fb80ec9ba5b62e4b7453ea45703d1ce58a':
  Extend unit test framework for Wifi soft AP configuration