Fixed shellcheck issues in the script (#2650)

* Changed for handling already upgrade in progress, changed frequency of cron and added command to upgrade without providing agent package

Signed-off-by: Tanmay Garg <[email protected]>

* fixed shellcheck

Signed-off-by: Tanmay Garg <[email protected]>

* Added scripts for EBS HRMS

* fixed linter

* fixed lintr checks

* added copyright header

* added scripts for EBSUM

* added missing header

* added readme

* fixed linter

* fixed linter issues

* fixed linter issues

* added custom jar

* fixed custom jar upgrade

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Signed-off-by: Tanmay Garg <[email protected]>