Unit Test Framework API

The Unit Test Framework is a new API that manages registration and
execution of unit tests in Asterisk with the purpose of verifying the
operation of C functions.  The Framework consists of a single test
manager accompanied by a list of registered test functions defined
within the code.  A test is defined, registered, and unregistered
from the framework using a set of macros which allow the test code
to only be compiled within asterisk when the TEST_FRAMEWORK flag is
enabled in menuselect.  This allows the test code to exist in the
same file as the C functions it intends to verify.  Registered tests
may be viewed and executed via a set of new CLI commands.  CLI commands
are also present for generating and exporting test results into xml
and txt formats.

For more information and use cases please refer to the documentation
provided at the beginning of the test.h file.

Review: https://reviewboard.asterisk.org/r/447/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@236027 65c4cc65-6c06-0410-ace0-fbb531ad65f3