Start a init_tests.cpp file for end-to-end tests that parse small init script
segments and verify that they act as expected.
The first tests ensure that the execution order of event triggers
happens appropriately.
Test: Boot bullhead, run unit tests
Change-Id: Ic446c02605ab796fd41e0596ce1fd381aee80ce0
Create a Parser class that uses multiple SectionParser interfaces to
handle parsing the different sections of an init rc.
Create an ActionParser and ServiceParser that implement SectionParser
and parse the sections corresponding to Action and Service
classes.
Remove the legacy keyword structure and replace it with std::map's
that map keyword -> (minimum args, maximum args, function pointer) for
Commands and Service Options.
Create an ImportParser that implements SectionParser and handles the
import 'section'.
Clean up the unsafe memory handling of the Action class by using
std::unique_ptr.
Change-Id: Ic5ea5510cb956dbc3f78745a35096ca7d6da7085
