CA-115742: VM name and description change not allowed via XenCenter for VM Admin - FIXED

The error has been caused by the shadow multiplier field on Advanced Settings page: XenCenter thinks that the values has changed, and tries to save it, but this is not allowed for VM Admin users.
The solution is:
- use -1 as the signal value for unparseable string, instead of 1.0, which is actually a valid value;
- display the existing value without formatting it to 2 deciaml places;
Also corrected the validation function, as the shadow multiplier has to be greater than or equal to 1, not 0.1.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
CA-115742: Removed unused variable.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
CA-137305: When creating a VM, ensure that the vGPUs are unset if not needed.

If a VM is created from snapshot which has a vGPU and "No" vGPU is selected  then the newly created VM shouldn't have a vGPU.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
CA-108676:  Put the Heartbeat and event.next sessions on their own ConnectionGroups.

Also make sure that the MeddlingAction's cancel session gets disposed.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
CA-137308: Checkpoint doesn't disappear follow deletion when switching to logs mode - FIXED

Force an update of the selected tab when switching back from Notification view, as some tabs ignore the update events when not visible (e.g. Snapshots, HA)

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
CP-5436: Modified the 'Updates' section and removed Licensing topics for Tech Preview
Merge pull request #104 from ushamandya/xs64bit

CP-5436: Modified the 'Updates' section and removed Licensing topics for...
Merge pull request #99 from MihaelaStoica/CA-115742

CA-115742: VM name and description change not allowed via XenCenter for ...
Merge pull request #101 from MihaelaStoica/CA-108676

CA-108676:  Put the Heartbeat and event.next sessions on their own ConnectionGroups
Merge pull request #103 from MihaelaStoica/CA-137308

CA-137308: Checkpoint doesn't disappear follow deletion when switching t...
Merge pull request #100 from MihaelaStoica/CA-137305

CA-137305: When creating a VM, ensure that the vGPUs are unset if not needed