semanage: list all ports even if not attributed with port_type

Show also ports which are not attributed with `port_type`. Such ports
may exist in custom policies and even the attribute `port_type` may
not be defined.

This fixes the following error:

Traceback (most recent call last):
  File "/usr/sbin/semanage", line 975, in <module>
    do_parser()
  File "/usr/sbin/semanage", line 947, in do_parser
    args.func(args)
  File "/usr/sbin/semanage", line 441, in handlePort
    OBJECT = object_dict['port'](args)
             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/seobject.py", line 1057, in __init__
    self.valid_types = list(list(sepolicy.info(sepolicy.ATTRIBUTE, "port_type"))[0]["types"])
                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^
IndexError: list index out of range

Signed-off-by: Topi Miettinen <toiwoton@gmail.com>

python/semanage/seobject.py

@@ -1055,7 +1055,7 @@ class portRecords(semanageRecords):
     def __init__(self, args = None):
         semanageRecords.__init__(self, args)
         try:
-            self.valid_types = list(list(sepolicy.info(sepolicy.ATTRIBUTE, "port_type"))[0]["types"])
+            self.valid_types = list(list(sepolicy.info(sepolicy.PORT))[0]["type"])
         except RuntimeError:
             pass