Revert "dom0/qrexec: use default user from VM settings"

This reverts commit b1ccc9a510e465b8b59f12bafb7735664c4101d0.
This can be handled by qrexec_daemon itself.

Conflicts:

	qrexec/qrexec_policy

qrexec/qrexec_policy

@@ -6,7 +6,6 @@ import subprocess
 import xen.lowlevel.xl
 import qubes.guihelpers
 from optparse import OptionParser
-from qubes.qubes import QubesVmCollection
 import fcntl
  
 POLICY_FILE_DIR="/etc/qubes_rpc/policy"
@@ -175,16 +174,7 @@ def main():
         if policy_dict.has_key("action.user"):
             user=policy_dict["action.user"]
         else:
-            qvm_collection = QubesVmCollection()
-            qvm_collection.lock_db_for_reading()
-            qvm_collection.load()
-            qvm_collection.unlock_db()
-            vm = qvm_collection.get_vm_by_name(target)
-            if vm is None:
-                print >> sys.stderr, "Cannot find settings of VM '%s', assuming default user 'user'" % target
-                user = "user"
-            else:
-                user = vm.default_user
+            user="user"
         do_execute(domain, target, user, exec_index, process_ident)
 
     print >> sys.stderr, "Rpc denied:", domain, target, exec_index