Run 'echo -t' without the patch will get the result:
echo: Unknown flag - '-t'
The expected result is to display '-t' literally.
This patch adds special handle for 'echo'. 'echo' will not use the
general parameter parsing library.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>