Werk #2448: Various Checks for Citrix XenApp 7.x Farms

Several new checks to gather information on Citrix VMs, hostsystems and controllers. citrix_state monitors various state variables of citrix instances, such as the power or registration state. citrix_controller checks whether the controller is active or not, citrix_controller.licensing monitors the licensing state, citrix_controller.session checks for the number of total, active and inactive sessions. Also included are a number of purely informative checks that are always OK.

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