wrapper ansicolor now support different colormap

The Ansi color plugin let you specify a different set of colors to use.
The plugin uses 'xterm' has a default and provides 'css' and 'vga'.  On
a white background, it seems 'vga' is a bit easier to the eyes.

Change-Id: I4108bfb9f3c7020ce5bfdfefe437353bbac2c122
Reviewed-on: https://review.openstack.org/35494
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins