tests/acceptance/virtiofs_submounts: required space between IP and port

AFAICT, there should not be a situation where IP and port do not have
at least one whitespace character separating them.

This may be true for other '\s*' patterns in the same regex too.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210203172357.1422425-10-crosa@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

tests/acceptance/virtiofs_submounts.py

@@ -83,7 +83,7 @@ def get_portfwd(self):
                               command_line='info usernet')
         for line in res.split('\r\n'):
             match = \
-                re.search(r'TCP.HOST_FORWARD.*127\.0\.0\.1\s*(\d+)\s+10\.',
+                re.search(r'TCP.HOST_FORWARD.*127\.0\.0\.1\s+(\d+)\s+10\.',
                           line)
             if match is not None:
                 port = int(match[1])