fix host_del

[thisguycodes]

Previously produces this error:

'error': {'code': 3005,
  'message': 'Unknown option: all',
  'name': 'OptionError'}

Works without all option. Also added explicit version (same version seen elsewhere in this library).

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This change is 

[ghost]

    def host_del(self, hostname):
        m = {'item': [hostname], 'method': 'host_del', 'params': {'all': True}}
        results = self.makeReq(m)

需要修改为

    def host_del(self, hostname):
        m = {'item': [hostname], 'method': 'host_del', 'params': {}}
        results = self.makeReq(m)

[acalm]

@thisguycodes, sorry for the extremely delayed response, but what version of freeipa are you running?