Jie Shen c71a25e912 Fix shellcheck warnings/errors in cluster/gce/upgrade.sh (#88576) ...

* Fix shellcheck warnings/errors in cluster/gce/upgrade.sh

* Update cluster/gce/upgrade.sh

Co-Authored-By: Slava Semushin <slava.semushin@gmail.com>

Co-authored-by: Slava Semushin <slava.semushin@gmail.com>

2020-04-30 21:26:06 -07:00

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