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).