'Shows detailed information for a security group rule.
For a full list of available parameters, please refer to the official
API reference:
http://developer.openstack.org/api-ref/networking/v2/index.html#show-security-group-rule'

def show_security_group_rule(self, security_group_rule_id, **fields):

    uri = ('/security-group-rules/%s' % security_group_rule_id)
    return self.show_resource(uri, **fields)
