Augment stats counters for apps.tap.tap
Augment stats counters for apps.tap.tap

Add counters for interface type, MAC address, MTU and operational
status to the apps.tap.tap app.  Also accept the MTU as a
configuration parameter to check whether the MTU configured on
the Snabb side matches the one configured on the TAP device to
avoid MTU mismatches.

alexandergall/snabbswitch,eugeneia/snabbswitch,dpino/snabb,snabbco/snabb,alexandergall/snabbswitch,Igalia/snabb,eugeneia/snabb,snabbco/snabb,dpino/snabbswitch,eugeneia/snabb,alexandergall/snabbswitch,Igalia/snabb,snabbco/snabb,Igalia/snabb,dpino/snabb,alexandergall/snabbswitch,alexandergall/snabbswitch,SnabbCo/snabbswitch,dpino/snabbswitch,dpino/snabbswitch,snabbco/snabb,SnabbCo/snabbswitch,Igalia/snabbswitch,eugeneia/snabb,Igalia/snabbswitch,eugeneia/snabb,eugeneia/snabb,eugeneia/snabbswitch,dpino/snabb,alexandergall/snabbswitch,snabbco/snabb,alexandergall/snabbswitch,dpino/snabb,Igalia/snabb,Igalia/snabbswitch,SnabbCo/snabbswitch,eugeneia/snabbswitch,dpino/snabb,snabbco/snabb,SnabbCo/snabbswitch,eugeneia/snabbswitch,Igalia/snabb,alexandergall/snabbswitch,dpino/snabb,Igalia/snabb,Igalia/snabb,eugeneia/snabb,dpino/snabbswitch,dpino/snabb,eugeneia/snabb,snabbco/snabb,Igalia/snabbswitch,snabbco/snabb,Igalia/snabb,eugeneia/snabb,Igalia/snabbswitch