ipgre: fix attribute IPGRE_ATTR_OKEY in ipgre_put_attrs()

Signed-off-by: Susant Sahani <susant@redhat.com>
Signed-off-by: Thomas Haller <thaller@redhat.com>
ipgre: rename new public API to avoid confusion

Signed-off-by: Susant Sahani <susant@redhat.com>
Signed-off-by: Thomas Haller <thaller@redhat.com>
ipvti: introduce vti tunnel support

Signed-off-by: Susant Sahani <susant@redhat.com>
[thaller@redhat.com: some whitespace fixes]
Signed-off-by: Thomas Haller <thaller@redhat.com>