app/testpmd: support different input color method

app/testpmd: support different input color method

To enable input coloring, based on VLAN or DSCP, patch adds
command line interface to configure the following:

 - configuring input coloring using VLAN or DSCP while creating
   meter i.e. during rte_mtr_create()

 - Update VLAN input coloring table at runtime.

 - configures protocol priorities.

 - retrieve protocol and priority information

Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>