reflog: cleanse messages in the refs.c layer

Regarding reflog messages:

 - We expect that a reflog message consists of a single line.  The
   file format used by the files backend may add a LF after the
   message as a delimiter, and output by commands like "git log -g"
   may complete such an incomplete line by adding a LF at the end,
   but philosophically, the terminating LF is not a part of the
   message.

 - We however allow callers of refs API to supply a random sequence
   of NUL terminated bytes.  We cleanse caller-supplied message by
   squashing a run of whitespaces into a SP, and by trimming trailing
   whitespace, before storing the message.  This is how we tolerate,
   instead of erring out, a message with LF in it (be it at the end,
   in the middle, or both).

Currently, the cleansing of the reflog message is done by the files
backend, before the log is written out.  This is sufficient with the
current code, as that is the only backend that writes reflogs.  But
new backends can be added that write reflogs, and we'd want the
resulting log message we would read out of "log -g" the same no
matter what backend is used, and moving the code to do so to the
generic layer is a way to do so.

An added benefit is that the "cleansing" function could be updated
later, independent from individual backends, to e.g. allow
multi-line log messages if we wanted to, and when that happens, it
would help a lot to ensure we covered all bases if the cleansing
function (which would be updated) is called from the generic layer.

Side note: I am not interested in supporting multi-line reflog
messages right at the moment (nobody is asking for it), but I
envision that instead of the "squash a run of whitespaces into a SP
and rtrim" cleansing, we can %urlencode problematic bytes in the
message *AND* append a SP at the end, when a new version of Git that
supports multi-line and/or verbatim reflog messages writes a reflog
record.  The reading side can detect the presense of SP at the end
(which should have been rtrimmed out if it were written by existing
versions of Git) as a signal that decoding %urlencode recovers the
original reflog message.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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