B #2179 Report RSS + swap usage for KVM VMs
B #2179 Report RSS + swap usage for KVM VMs

_max_memory_ is always equal to Available because:
  1. the memballoon is not used for resizing VM memory 
  2. the memballoon stats reporting is not enabled by default:

  ```
  <memballoon model='virtio'>
        <stats period='10'/>
    </memballoon>
  ```

(cherry picked from commit 92d1ff6b11b3adf0c3d7e98e57ce2555c077e694)

atodorov-storpool/one,baby-gnu/one,baby-gnu/one,atodorov-storpool/one,atodorov-storpool/one,baby-gnu/one,atodorov-storpool/one,baby-gnu/one,OpenNebula/one,baby-gnu/one,OpenNebula/one,OpenNebula/one,OpenNebula/one,atodorov-storpool/one,baby-gnu/one,OpenNebula/one,OpenNebula/one,baby-gnu/one,OpenNebula/one,OpenNebula/one,atodorov-storpool/one,atodorov-storpool/one,baby-gnu/one,atodorov-storpool/one,atodorov-storpool/one,OpenNebula/one