BaseTools: Ecc - add dict for config file to internal translation

BaseTools: Ecc - add dict for config file to internal translation

Commit eece4292acc80 changed a variable name, which was tied directly to
a config file entry. This seperates the internal variable names from
the config file entries by having the internal dict accessed through a
translation of key words.

added a test when this is run straight from command line.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>