Update XenGuestAgent to #30 b1f36c2d0aacd347f78c62737b2b074cbb3e9b92

Signed-off-by: Ben Chalmers <Ben.Chalmers@citrix.com>
Merge pull request #14 from benchalmers/guest30

Update XenGuestAgent to #30 b1f36c2d0aacd347f78c62737b2b074cbb3e9b92

Approved-By: Ben Chalmers <ben.chalmers@citrix.com>