Description of problem:

cannot run API scripts through https on Fedora clients

api.py:
#!/usr/bin/python
import sys
import xmlrpclib
client = xmlrpclib.Server(sys.argv[1], verbose=0)
print client.api.getVersion()


it works locally:
# python api.py https://$(hostname)/rpc/api
19

but if I run it against remote Spacewalk server
# python api.py https://spacewalk/rpc/api
Traceback (most recent call last):
  File "api.py", line 8, in <module>
    print client.api.getVersion()
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1243, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1602, in __request
    verbose=self.__verbose
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1283, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1311, in single_request
    self.send_content(h, request_body)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1459, in send_content
    connection.endheaders(request_body)
  File "/usr/lib64/python2.7/httplib.py", line 1053, in endheaders
    self._send_output(message_body)
  File "/usr/lib64/python2.7/httplib.py", line 897, in _send_output
    self.send(msg)
  File "/usr/lib64/python2.7/httplib.py", line 859, in send
    self.connect()
  File "/usr/lib64/python2.7/httplib.py", line 1278, in connect
    server_hostname=server_hostname)
  File "/usr/lib64/python2.7/ssl.py", line 353, in wrap_socket
    _context=self)
  File "/usr/lib64/python2.7/ssl.py", line 601, in __init__
    self.do_handshake()
  File "/usr/lib64/python2.7/ssl.py", line 830, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590)

http works
# python api.py http://spacewalk/rpc/api
19

Version-Release number of selected component (if applicable):
Fedora 23, 24

How reproducible:
always

Steps to Reproduce:
1. run API script from Fedora client