def get_instance namespace, classname=nil, properties={}
    case namespace
    when Sfcc::Cim::ObjectPath
      objectpath = namespace
      namespace = objectpath.namespace
    else
      objectpath = objectpath namespace.to_s, classname, properties
    end
    ret = []
    @client.get_instance(objectpath)
  end
def get_instance namespace, classname=nil, properties={}
    case namespace
    when Sfcc::Cim::ObjectPath
      objectpath = namespace
      namespace = objectpath.namespace
    else
      objectpath = objectpath namespace.to_s, classname, properties
    end
    ret = []
    @client.get_instance(objectpath)
  end
Return matching Wbem::Instance for first instance
  matching namespace, classname, properties
 @param namespace : String or Sfcc::Cim::ObjectPath
 @param classname : String (optional)
 @param properties : Hash (optional)