Change akanda devstack configuration file directory

DHC-1841

Make akanda devstack install config files into the same
/etc dir as our production configuration.

Change-Id: I7aab94e8bbd28fd518a302664c8b4f69b43a4312
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Merge pull request #99 from rodis/feature/change-akanda-conf-dir

Change akanda devstack configuration file directory