pactest: add prefix to temporary directory

This makes cleaning up /tmp after several --keep-root runs much easier.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

test/pacman/pactest.py

@@ -84,7 +84,7 @@ def create_parser():
         sys.exit(1)
 
     # instantiate env and parser objects
-    root_path = tempfile.mkdtemp()
+    root_path = tempfile.mkdtemp(prefix='pactest-')
     env = pmenv.pmenv(root=root_path)
     opt_parser = create_parser()
     (opts, args) = opt_parser.parse_args()