Correct potential leaks in xapp class.

Correct potential leaks in xapp class.

Sonar identified some potential memory leaks in the run function
of the xapp class. This change addresses those issues, and ensures
that the unused parameter grumblings which were attempted to be
corrected in the last change are also addressed.

Issue-ID: RIC-629

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: I2fe2f4b681780cd60235a0c38ed4709af871abbe