Incoporate oslo.config facilities in Inception

Convert Inception code to use a configuration file and command line options as
processed by oslo.config.

+ orchestrator modified to use oslo.config for options
+ sample config file introduced
+ dependency on oslo.config added to setup.py
+ version string moved from setup.py to module init for ready access
  for --version and others

Implements: blueprint Inception Configuration Blueprint
Change-Id: I984700867d8ddf5ee1602cc4ed6608f36a38a6be