CA-116417: Added Host_metrics to GC
Issue: The host metrics objects do not get GC'ed currently because of
which they keep accumulating over a period of time for invalid hosts

Fix: Creating two sets of host_metrics objects. One has all the
host_metrics objects both valid and invalid, and second has all
the host_metrics objects only for valid hosts. Removing all the
invalid host_metrics objects from the first set with the help
of second set.
Signed-off-by: Ravi Pandey <ravi.pandey@citrix.com>
Probe via SMAPIv2 where we can

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
Add a trivial XML printer for probe results.

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
Merge pull request #1589 from ravippandey/CA-116417

CA-116417: Added Host_metrics to GC
Merge pull request #1590 from jonludlam/probe

Probe via SMAPIv2 where we can
Merge pull request #1593 from robhoes/master

Add documentation for PIF.properties
Merge pull request #1595 from robhoes/master

Switch off GRO by default (until issues with it have been solved)