bittopaz: Alicloud: fix error msg when check hostname

JobBuild
cc3968b7
10-20 16:06
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pull-kops-e2e-kubernetes-aws 1185950309780819984 1185950309780819977
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pull-kops-verify-generated 1185950309780819986 1185950309780819975
pull-kops-verify-gofmt 1185950309780819980 1185950309910843392
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pull-kops-verify-govet 1185950309910843394 1185950309780819973
pull-kops-verify-packages 1185950309915037696 1185950309780819974