Add API allowing xAPPs to send alarm messages

This change adds the ability for an xAPP to send alarms to
the alarm collector/manager via RMR messages.

This is a BREAKING change because the C++ framework classes
are all now wrapped in the xapp:: namespace.

Issue-ID: RIC-426

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: I552292d57e987313ec684bd55f8780ef5fba74fe
44 files changed