add cluster.mieweb.org internal domain

[runleveldev]

Resolves unqualified container names or container names with .cluster.mieweb.org as the domain part to their IP address. Still resolves *.opensource.mieweb.org to the Load Balancer for SSL handling.

Example of it working:

rgingras@create-a-container-dev:~/opensource-server$ host create-a-container
create-a-container.cluster.mieweb.org has address 10.15.221.118
rgingras@create-a-container-dev:~/opensource-server$ host create-a-container.opensource.mieweb.org
create-a-container.opensource.mieweb.org has address 10.15.20.69
rgingras@create-a-container-dev:~/opensource-server$ host create-a-container.opensource.mieweb.com
create-a-container.opensource.mieweb.com has address 10.15.20.69
create-a-container.opensource.mieweb.com is an alias for opensource.mieweb.com.
create-a-container.opensource.mieweb.com is an alias for opensource.mieweb.com.

Remaining issue: statically allocated IP addresses, such as for the Proxmoxes and the default gateway still do not resolve on the cluster subdomain. Possible solution includes a static /etc/dnsmasq.d/hosts file with the mapping, but that's not portable.

[cmyers-mieweb]

Looks good, will deploy Monday