extract-ofp-errors: Remove support for hexadecimal error types.

This feature wasn't used and removing it slightly simplifies the code.

Signed-off-by: Ben Pfaff <blp@nicira.com>
ofproto-dpif-xlate: Hide 'struct xlate_ctx'.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
ofproto-dpif: Check for MPLS depth at the flow.

The earlier check on base_flow.mpls_depth seemed wrong, as multiple
MPLS push actions would have resulted in the flow.mpls_depth being
set to 1 each time.

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