examples/pipeline: fix VXLAN script permission
examples/pipeline: fix VXLAN script permission

This python script provides a shebang that only makes sense if the
script has the executable bit set.

Fixes: fde7a772701a ("examples/pipeline: add VXLAN encapsulation example")
Cc: stable@dpdk.org

Reported-by: Timothy Redaelli <a4b59bb75648eb5009c48ef2c8b66a57977abb22@redhat.com>
Signed-off-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>
Acked-by: Cristian Dumitrescu <25468b8a3698eeb3c368247f8635924bb4a1ce2c@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk