ws: Fix testing race with ssh-agent unix socket
ws: Fix testing race with ssh-agent unix socket

We see this from time to time:

mock-agent-bridge-WARNING **: bridge couldn't spawn agent Child process exited with code 1: bind: Address already in use

This is because in a previous test the ssh-agent hasn't yet had
time to remove the socket.

Closes #5170
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

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