python: stream: Fix unlink attempt for ptcp IP address.

While creating passive TCP connections the library stores part of the
connection method as a bind path regardless of it being a path.  And
then it may attempt to unlink it on close:

 fatal-signal | WARN | could not unlink "27.0.0.1:58866"
                       (No such file or directory)

Unlinking only makes sense for unix sockets, not TCP, so the variable
should only be initialized for "punix" case.  It's not a big problem
since those files are unlikely to exist, but it generates strange
warnings in the logs.

Fixes: af35823 ("python: Add TCP passive-mode to IDL.")
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

Author: igsilya

python/ovs/stream.py

@@ -585,9 +585,9 @@ def open(name):
         if not PassiveStream.is_valid_name(name):
             return errno.EAFNOSUPPORT, None
 
-        bind_path = name[6:]
+        bind_path = None
         if name.startswith("punix:"):
-            bind_path = ovs.util.abs_file_name(ovs.dirs.RUNDIR, bind_path)
+            bind_path = ovs.util.abs_file_name(ovs.dirs.RUNDIR, name[6:])
             if sys.platform != 'win32':
                 error, sock = ovs.socket_util.make_unix_socket(
                     socket.SOCK_STREAM, True, bind_path, None)