Revert "qrexec: fix "yes to all" for qrexec calls with custom argument"

Do not copy policy file at arbitrary time.
This reverts commit 1dff6361b7.

qrexec/qrexec-policy

@@ -9,7 +9,6 @@ import qubes.guihelpers
 import libvirt
 from optparse import OptionParser
 import fcntl
-import shutil
 
 POLICY_FILE_DIR="/etc/qubes-rpc/policy"
 # XXX: Backward compatibility, to be removed soon
@@ -137,12 +136,7 @@ def confirm_execution(domain, target, service_name):
 def add_always_allow(domain, target, service_name, options):
     policy_file=POLICY_FILE_DIR+"/"+service_name
     if not os.path.isfile(policy_file):
-        # if we add "always allow" for specifc argument value, base the new
-        # file on the generic one
-        policy_file_source = os.path.join(POLICY_FILE_DIR, service_name.split("+")[0])
-        if not os.path.isfile(policy_file_source):
-            return None
-        shutil.copy2(policy_file_source, policy_file)
+        return None
     f = open(policy_file, 'r+')
     fcntl.flock(f, fcntl.LOCK_EX)
     lines = []