Handle complex chars policy correctly

* We needed to set DevicePolicyMnager.PASSWORD_QUALITY_COMPLEX
* Setting this, we also need to clear some of the defaults for complex
  mode that are not correct for Exchange's definition of "complex".
* Unit tests

Bug: 4092218
Change-Id: Iea7bd05d48f1aa9406222c1db5937cfd7f2662b8
3 files changed