Add a generic config parser for the INI file format.

There are currently multiple INI parsers in bluedroid and they're
special-purpose for the task at hand even though they parse the
same format. This implementation is general-purpose, loosely coupled
with the rest of bluedroid, and has unit tests to verify behaviour.

Change-Id: I61caf416cc16d76b871cbf04f333c26894ab3fef
4 files changed