app/testpmd: fix PF/VF check of flow director

app/testpmd: fix PF/VF check of flow director

Parameters pf & vf are added into most of flow director
filter CLIs.
But mac-vlan and tunnel filters don't have these parameters,
the parameters should not be checked for mac-vlan and tunnel
filters.

Fixes: e6a68c013353 ("app/testpmd: extend commands for flow director in VF")
Reported-by: Frederico Cadete <frederico.cadete-ext@oneaccess-net.com>
Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>