conf: create directories before dropping root

Create logdir and dumpdir before dropping root. Set their uid/gid to the
user chronyd will switch to. This allows chronyd to create the
directories in a directory where the user won't have write permissions
(e.g. /var/lib).

logging.c

@@ -299,18 +299,6 @@ LOG_FileWrite(LOG_FileID id, const char *format, ...)
 
 /* ================================================== */
 
-void
-LOG_CreateLogFileDir(void)
-{
-  const char *logdir;
-
-  logdir = CNF_GetLogDir();
-
-  UTI_CreateDirAndParents(logdir, 0755, 0, 0);
-}
-
-/* ================================================== */
-
 void
 LOG_CycleLogFiles(void)
 {