flow: Regularise flow specific logging helpers

flow.h has a collection of logging helpers that automatically include
information about a specific flow.  Which variants are present are a bit
ad-hoc, based on what we happened to want use (e.g. there are no
LOG_WARNING level versions, at present).  There's also a rather awkward
and only occasionally used flow_log_details_() helper to print additional
log messages with more details of the flow (basically its addresses).
It's particularly awkward to try to combine that with ratelimiting.

Re-organise this to be based around a flow_log__() internal helper, which
has bool parameters to include strerror() / perror information and/or
the extra details.  Add wrapper macros for all combinations of perror,
ratelimiting and DEBUG/WARNING/ERR priorities.

Be a little more consistent about parameter order between the various
functions / macros / wrappers while we're at it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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