Description of problem:

If we provide an rgw_frontends like beast port=80 ssl_port=443, the frontend fails to load the page and we get a trace in the mgr log like below

bash[32475]: Internal Server Error
bash[32475]: Traceback (most recent call last):
bash[32475]:   File "/usr/share/ceph/mgr/dashboard/services/exception.py", line 47, in dashboard_exception_handler
bash[32475]:     return handler(*args, **kwargs)
bash[32475]:   File "/lib/python3.6/site-packages/cherrypy/_cpdispatch.py", line 54, in __call__
bash[32475]:     return self.callable(*self.args, **self.kwargs)
bash[32475]:   File "/usr/share/ceph/mgr/dashboard/controllers/_base_controller.py", line 263, in inner
bash[32475]:     ret = func(*args, **kwargs)
bash[32475]:   File "/usr/share/ceph/mgr/dashboard/controllers/_rest_controller.py", line 191, in wrapper
bash[32475]:     return func(*vpath, **params)
bash[32475]:   File "/usr/share/ceph/mgr/dashboard/controllers/rgw.py", line 108, in list
bash[32475]:     'port': int(metadata['frontend_config#0'].split('port=')[1])
bash[32475]: ValueError: invalid literal for int() with base 10: '443 ssl_certificate=config://rgw/cert/rgw.NBDFSv2.NBDFS.C3'
bash[32475]: [::ffff:10.3.34.90:32990] [GET] [500] [0.004s] [nbadmin] [513.0B] /api/rgw/daemon
bash[32475]: [b'{"status": "500 Internal Server Error", "detail": "The server encountered an unexpected condition which prevented it from fulfilling the request.", "request_id": "ba61646e-eb89-43eb-89d0-156ec3ffc2b7"}



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