Log: Another step in the move from logfiles to priorities.

skygw_[enable|disable]_log has now been removed from the external
interface and priorities must instead be set using
mxs_log_set_priority_enabled(int priority, bool enabled). A bitmask
is already being updated, but internally and as used by the LOG_IF
macros, the actual enabling is still made using logfile ids.

The configuration entries have been replaced as follows:

	log_messages -> log_notice
	log_trace    -> log_info

The old ones can be used, but cause a warning to be logged.

Similarily the maxadmin commands have been updated.
"[enable|disable] log ..." works as expected, but there will be
a message about it being deprecated. Instead there is now a
[enable|disable] log-priority err|warning|notice|info|debug
command that should be used instead.

log_manager/test/testlog.c

@@ -62,6 +62,38 @@ const int N_THR = 4;
 #define TEST_ERROR(msg)\
     do { fprintf(stderr, "[%s:%d]: %s\n", basename(__FILE__), __LINE__, msg); } while (false)
 
+static logfile_id_t id_to_priority(logfile_id_t id)
+{
+    switch (id)
+    {
+    case LOGFILE_ERROR:
+        return LOG_ERR;
+
+    case LOGFILE_MESSAGE:
+        return LOG_NOTICE;
+
+    case LOGFILE_TRACE:
+        return LOG_INFO;
+
+    case LOGFILE_DEBUG:
+        return LOG_DEBUG;
+
+    default:
+        assert(!true);
+        return LOG_ERR;
+    }
+}
+
+static void skygw_log_enable(logfile_id_t id)
+{
+    mxs_log_set_priority_enabled(id_to_priority(id), true);
+}
+
+static void skygw_log_disable(logfile_id_t id)
+{
+    mxs_log_set_priority_enabled(id_to_priority(id), false);
+}
+
 int main(int argc, char* argv[])
 {
     int              err = 0;