ovsdb-client: Show even constraint-breaking data in "dump" output.

ovsdb-client: Show even constraint-breaking data in "dump" output.

The ovsdb-client "dump" command is a fairly low-level tool that can be
used, among other purposes, to debug the OVSDB protocol.  It's better if
it just prints what the server sends without being too judgmental about it.
Thus, we might as well ignore constraints for the purpose of dumping
tables.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Justin Pettit <jpettit@ovn.org>