Added cmdline option support to config.py
Added cmdline option support to config.py

A command line option will override both the default and any environment
definition of the variable

mklight/eCMD,mklight/eCMD,mklight/eCMD,mklight/eCMD,mklight/eCMD,open-power/eCMD,open-power/eCMD,open-power/eCMD,open-power/eCMD,open-power/eCMD