[CP-6209] Initial version of the lite guest agent

Signed-off-by: Ben Chalmers <Ben.Chalmers@citrix.com>
Merge branch 'cp-6209-new3' into cp-6209-new
Merge pull request #1 from benchalmers/upstream-cp-6209

[CP-6209] Add the lite guest aganet to the xeniface build
Approved-By: Ben Chalmers <ben.chalmers@citrix.com>