Cluster updates: better support when running in containers
- generalized servers running with an INADDR_ANY address
- handling of running server with ephemeral ports
- streamline function and variable names
- added ./tcl/acs-container-procs.tcl
* make container definitions independent of cluster handling
* create container mapping based on a JSON file, which
can be obtained from docker to get information about
external addresses
* The final interface is a mapping file in Tcl providing at least
the Tcl dict ::docker::containerMapping containing the docker
mapping. A dict key like "8080/tcp" (internal port) will return a
dict containing the keys "host", "port" and "proto" (e.g. proto
https host 192.168.1.192 port 58115).