[MERGE] Clean up SSH_AUTH_SOCK for selftest

[Jelmer Vernooij]

The attached trivial patch cleans up the SSH_AUTH_SOCK variable for
selftest, which is causing bzr selftest to prompt for my ssh key
passphrase (I'm using gpg-agent with ssh support enabled). Cleaning up
SSH_AUTH_SOCK prevents this.

Cheers,

Jelmer
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