[JENKINS-27152] Use a standardized directory for $SSH_AUTH_SOCK

[jglick]

JENKINS-27152

@reviewbybees

[ghost]

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[jglick]

Will check test failure; do not think I get it locally.

[jenkinsadmin]

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[amuniz]

Looks good, but the test fail is suspicious.

The test passes for me locally (even with some stacktraces). I can see this log line:

[sshAgentAvailableAfterRestart #1] SSH Agent before restart /tmp/jenkins2298050772070608259.jnr

But the same line (guessed by position) in the CI build log is:

[sshAgentAvailableAfterRestart #1] SSH Agent before restart /tmp/ssh1266015111258068214

[amuniz]

🐝