CA-169170: “Switch to Remote desktop” button should not be disabled in Cream when Windows VM installed with latest PV tools.
CA-169170: “Switch to Remote desktop” button should not be disabled in Cream when Windows VM installed with latest PV tools.

Check current XenServer Version, if current version is greater than Cream and PV tool installed, do not disable control button.

Signed-off-by: Cheng Zhang <f157832f2f1df5a7c962d3abb092f6b1ea020882@citrix.com>

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