This patch allows to pass a tag when specifying
the dpdk `dev { }` interface configuration.
It allows a control plane generating a vpp.conf
file to retreive the resulting mapping between
dpdk interfaces & sw_if_indices in VPP without
having to change the interface name exposed
to the user.
Type: feature
Change-Id: I55907417de0083b82d4a127172816cec3459acf3
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>