cmdutil: normalize log message eols when reading from file

This will be necessary once util.readfile() operates in binary mode. While
changelog.add() already normalizes the message, doing so in logmessage() is
required as ui.edit() or others expect messages with LF only.

mercurial/cmdutil.py

@@ -91,7 +91,7 b' def logmessage(opts):'
             if logfile == '-':
                 message = sys.stdin.read()
             else:
-                message = util.readfile(logfile)
+                message = '\n'.join(util.readfile(logfile).splitlines())
         except IOError, inst:
             raise util.Abort(_("can't read commit message '%s': %s") %
                              (logfile, inst.strerror))