mc used to show a warning messages during mirroring when it
detects a need to overwrite or remove a remote object but no
flag is specified. This commit efeaf2ee721761ba4e801407fb382c5c0f42938a
changed this behavior but this commit will restablish
the old behavior.
The probe package is no longer available in the Minio server
repo. This change just moves probe from the vendor directory to its
own dir under `pkg`.
This is a maintenance fix.
