datapath: Send to userspace errors shouldn't halt processing.

datapath: Send to userspace errors shouldn't halt processing.

If we encounter an error when sending a packet to userspace due to
an explicit action we stop processing further actions.  This makes
sense for things like push vlan, where to continue means outputting
an incorrect packet.  However, sending to userspace is more akin
to outputting to a port, which does not halt further processing.
For consistency, ignore errors in this case as well.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>