Up xeniface to #8

Changes
[CA-119964] Add (excessive) event logging to id potential WMI failures
[ca-119964] Store LiteAgent symbols in xeniface tarfile
[CA-119964] Do not fail when WMI Remove does not provide a respose object

Signed-off-by: Ben Chalmers <Ben.Chalmers@citrix.com>
Merge pull request #30 from benchalmers/ca-119964

Up xeniface to #8

Approved-By: Ben Chalmers <Ben.Chalmers@citrix.com>