fix krb5config location for z/OS failures

[Zech-Hein]

• I have considered the risk of behavior change or other zero migration impact (https://github.com/OpenLiberty/open-liberty/wiki/Behavior-Changes).
• If this PR fixes an Issue, the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN" (verify release bug label if applicable: https://github.com/OpenLiberty/open-liberty/wiki/Open-Liberty-Conventions).
• If this PR resolves an external Known Issue (including APARS), the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN".

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[Zech-Hein]

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[Zech-Hein]

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[Zech-Hein]

!build
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spawn.zos

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[LibbyBot]

Code analysis and actions

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• 1 FAT files were changed, added, or removed.

• Check that the build did not break the affected FAT suite(s).

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[LibbyBot]

Code analysis and actions

DO NOT DELETE THIS COMMENT.

• 2 FAT files were changed, added, or removed.

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[LibbyBot]

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[Zech-Hein]

!build
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spawn.zos

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[LibbyBot]

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[Zech-Hein]

For the record, (!)build with spawn zos doesn't work. see https://github.ibm.com/websphere/WS-CD-Open/wiki/Requesting-a-Personal-Build-that-tests-against-zOS

#build
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spawn.zos=true

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[LibbyBot]

Code analysis and actions

DO NOT DELETE THIS COMMENT.

• 2 FAT files were changed, added, or removed.

• Check that the build did not break the affected FAT suite(s).

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