Remove obsolete policy files

Qrexec policy is really stored in core-admin repo.

qubes-rpc/qubes.Filecopy.policy

@@ -1,6 +0,0 @@
-## Note that policy parsing stops at the first match,
-## so adding anything below "$anyvm $anyvm action" line will have no effect
-
-## Please use a single # to start your custom comments
-
-$anyvm	$anyvm	ask

qubes-rpc/qubes.OpenInVM.policy

@@ -1,7 +0,0 @@
-## Note that policy parsing stops at the first match,
-## so adding anything below "$anyvm $anyvm action" line will have no effect
-
-## Please use a single # to start your custom comments
-
-$anyvm	$dispvm	allow
-$anyvm	$anyvm	ask

qubes-rpc/qubes.VMShell.policy

@@ -1,7 +0,0 @@
-## Note that policy parsing stops at the first match,
-## so adding anything below "$anyvm $anyvm action" line will have no effect
-
-## Please use a single # to start your custom comments
-
-$anyvm	$dispvm	allow
-$anyvm	$anyvm	ask