build: stop trying to build py2 versions of vpp_papi
build: stop trying to build py2 versions of vpp_papi

Python2 was EOL's in Jan 2020.
RHEL6 was EOL'd in Nov 2020.

Type: fix

Change-Id: Id6910258cfe808c1e6a8fe16334c23d7991509dc
Signed-off-by: Paul Vinciguerra <b92f79aabe4c9c18085c7347110a52af0898a0ef@vinciconsulting.com>

FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp