maniacs-setup fails with MAAS 3.3.0

The maniacs-setup script is failing when run against MAAS 3.3.0. The script crashes, with no error output, after displaying the text "Initializing rack controller." If re-run, the script will run to completion; however, logging into the MAAS server shows no subnets defined.

The cause appears to be a change to the MAAS CLI API. Currently, maniacs-setup's setup_ip_ranges() function includes a number of calls to set up IP address ranges, beginning with:

    echo "* Initializing rack controller"
    maas admin ipranges create type=dynamic start_ip="$DHCP_RANGE_LOW" end_ip="$DHCP_RANGE_HIGH" > /dev/null

That second line, if entered manually (with suitable variable substitution), produces an error message:

$ maas admin ipranges create type=dynamic start_ip=172.24.124.1 end_ip=172.24.124.255
{"subnet": ["This field is required."]}

Obviously, maniacs-setup must be updated to cope with this change to MAAS. It's possible that some other lines in this same block of code will need changing, too.