Fix issue #23774 Make transport_test use exec

Some ansible hosts are not directly reachable
via socket connections.  It is best to use
the transport mechanism itself than to assume
that the host is reachable via socket.

If we can exec a command, then the transport
is working.

lib/ansible/plugins/connection/accelerate.py

@@ -101,10 +101,9 @@ def _connect(self):
     def transport_test(self, connect_timeout):
         ''' Test the transport mechanism, if available '''
         host = self._play_context.remote_addr
-        port = int(self._play_context.accelerate_port or 5099)
-        display.vvv("attempting transport test to %s:%s" % (host, port))
-        sock = socket.create_connection((host, port), connect_timeout)
-        sock.close()
+        display.vvv("attempting transport test to %s" % host)
+        self.reset()
+        self.exec_command("exit")
 
     def send_data(self, data):
         packed_len = struct.pack('!Q',len(data))

lib/ansible/plugins/connection/paramiko_ssh.py

@@ -135,10 +135,9 @@ class Connection(ConnectionBase):
     def transport_test(self, connect_timeout):
         ''' Test the transport mechanism, if available '''
         host = self._play_context.remote_addr
-        port = int(self._play_context.port or 22)
-        display.vvv("attempting transport test to %s:%s" % (host, port))
-        sock = socket.create_connection((host, port), connect_timeout)
-        sock.close()
+        display.vvv("attempting transport test to %s" % host)
+        self.reset()
+        self.exec_command("exit")
 
     def _cache_key(self):
         return "%s__%s__" % (self._play_context.remote_addr, self._play_context.remote_user)

lib/ansible/plugins/connection/ssh.py

@@ -214,10 +214,9 @@ def _connect(self):
 
     def transport_test(self, connect_timeout):
         ''' Test the transport mechanism, if available '''
-        port = int(self.port or 22)
-        display.vvv("attempting transport test to %s:%s" % (self.host, port))
-        sock = socket.create_connection((self.host, port), connect_timeout)
-        sock.close()
+        display.vvv("attempting transport test to %s" % self.host)
+        self.reset()
+        self.exec_command("exit")
 
     @staticmethod
     def _create_control_path(host, port, user):

lib/ansible/plugins/connection/winrm.py

@@ -90,10 +90,9 @@ def __init__(self,  *args, **kwargs):
     def transport_test(self, connect_timeout):
         ''' Test the transport mechanism, if available '''
         host = self._winrm_host
-        port = int(self._winrm_port)
-        display.vvv("attempting transport test to %s:%s" % (host, port))
-        sock = socket.create_connection((host, port), connect_timeout)
-        sock.close()
+        display.vvv("attempting transport test to %s" % host)
+        self.reset()
+        self.exec_command("Exit")
 
     def set_host_overrides(self, host, hostvars=None):
         '''