Change logging format for flows to that accepted by ofproto/trace.
flow_format() logs packets contents. However, the format used is not
the format accepted by ofproto/trace. Hence it becomes difficult to
trace the packets using the debugs printed. With this commit, the
logging of the packet contents is done in a format that is accepted
by ofproto/trace. This will make debugging easier.
Signed-off-by: Mehak Mahajan <mmahajan@nicira.com> Acked-by: Ethan Jackson <ethan@nicira.com>