MINOR: mworker/cli: set expert/experimental mode from the CLI

Allow to set the master CLI in expert or experimental mode. No command
within the master are unlocked yet, but it gives the ability to send
expert or experimental commands to the workers.

    echo "@1; experimental-mode on; del server be1/s2" | socat /var/run/haproxy.master -
    echo "experimental-mode on; @1 del server be1/s2" | socat /var/run/haproxy.master -
3 files changed