8377934: containers/docker/TestJcmd.java skipped GID xxx already exists

[sendaoYan]

Hi all,

Test containers/docker/TestJcmd.java report skipped "groupadd: GID '998' already exists" because the group id has been occupy by some other group. This PR move the GID which get from getent group %s | cut -d: -f1 to new GID 9999, and then return true forcely to avoid return fail when there is no gruop occpy the expected GID. GID number larger that 1000 will be empty generally.

Change has been verified locally. Test-fix only, no risk.

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Issue

• JDK-8377934: containers/docker/TestJcmd.java skipped GID xxx already exists (Bug - P4)

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