This change introduces the ability to load and parse
the json xapp descriptor (config) file. It also provides
the ability for the xAPP to register a callback function
which is executed when the descriptor is changed.
Issue-ID: RIC-428
Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: I7a1147aa8055599ef4b36ab17960e32ccb5b741f