Get rid of the MonitorEvent from CACHE context
Get rid of the MonitorEvent from CACHE context

The event is being signalled but nothing ever takes notice of it so one
can only conclude that it is not needed.

Signed-off-by: Paul Durrant <dba6cd059c0054f8a3c62ba902cd9d7238853ee4@citrix.com>

rneilturner/xenbus,rneilturner/xenbus,rneilturner/xenbus,MarkKMueller/xenbus,QubesOS/qubes-vmm-xen-win-pvdrivers-xenbus,QubesOS/qubes-vmm-xen-win-pvdrivers-xenbus,omeg/xenbus,QubesOS/qubes-vmm-xen-win-pvdrivers-xenbus,omeg/xenbus,MarkKMueller/xenbus,MarkKMueller/xenbus,omeg/xenbus