tests/acceptance/virtiofs_submounts: standardize port as integer

Instead of having to cast it whenever it's going to be used, let's
standardize it as an integer, which is the data type that will be
used most often.

Given that the regex will only match digits, it's safe that we'll
end up getting a integer, but, it could as well be a zero.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Message-Id: <20210203172357.1422425-9-crosa@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

tests/acceptance/virtiofs_submounts.py

@@ -86,17 +86,18 @@ class VirtiofsSubmountsTest(BootLinux):
                 re.search(r'TCP.HOST_FORWARD.*127\.0\.0\.1\s*(\d+)\s+10\.',
                           line)
             if match is not None:
-                port = match[1]
+                port = int(match[1])
                 break
 
         self.assertIsNotNone(port)
-        self.log.debug('sshd listening on port: ' + port)
+        self.assertGreater(port, 0)
+        self.log.debug('sshd listening on port: %d', port)
         return port
 
     def ssh_connect(self, username, keyfile):
         self.ssh_logger = logging.getLogger('ssh')
         port = self.get_portfwd()
-        self.ssh_session = ssh.Session('127.0.0.1', port=int(port),
+        self.ssh_session = ssh.Session('127.0.0.1', port=port,
                                        user=username, key=keyfile)
         for i in range(10):
             try: