def set_host(self, host):
        self.host = host
Get an instance or raise if it does not exist.
dataset/ETHPy150Open takeshixx/python-ssllabs/ssllabs.py/SSLLabsAssessment.set_host--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/db/api.py/instance_get_by_uuid