test.c: Add unit test registration checks for summary and description.

test.c: Add unit test registration checks for summary and description.

Added checks when a unit test is registered to see that the summary and
description strings do not end with a new-line '\n' for consistency.

The check generates a warning message and will cause the
/main/test/registrations unit test to fail.

* Updated struct ast_test_info member doxygen comments.

Change-Id: I295909b6bc013ed9b6882e85c05287082497534d