Made HOST a config option

Externalized configuration of host string
Made HOST a config option

Externalized configuration of host string- no longer necessary to modify runserver.py file in order to set host='0.0.0.0'
Removed unnecessary imports

Decluttered code, removed imports from previous tests that were no longer required
Removed unnecessary functions

Cleaned up code, removed the loadconfigs function as it was unnecessary, commented out HOST line.
Merge branch 'bug4266_host_config'