beautytiger: fix shellcheck in cluster/gce/config-common.sh

JobBuild
cd929a98
09-18 16:04
82357
09-10 18:08
e08742d8
09-10 18:07
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pull-kubernetes-e2e-gce-rbe 1174353407457103874 1173207593368162305 1171846717029486593 1171485259536011264
pull-kubernetes-integration 1174353407427743745 1171846716962377732 1171485259519234049
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pull-kubernetes-verify 1174353407469686785 1171846847006773248 1171485259590537216