ofproto-dpif.at: Remove push_vlan from an OF1.0 test.

ofproto-dpif.at: Remove push_vlan from an OF1.0 test.

Remove push_vlan from an OF1.0 test, as it requires OF1.1+ support, but was
silently discarded.  A later patch will make this test to fail due to
validation of usable OpenFlow protocol versions while parsing actions.

It should be noted that existing controllers may depend on the silently
discarded push_vlan being accepted during the action validation code at the
switch, as OpenFlow 1.0 supports setting a vlan ID, which will implicitly
push a vlan header, if it did not exist already.

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>