unix-socket: fix alert metadata logging

This changeset fixes a bug that was preventing suricata to dump
alert metadata info when running in unix-socket mode.
When running in unix-socket mode, suricata was skipping the
initialization of the output modules and, as a consequence,
the metadata output module was never invoked.

src/suricata.c

@@ -2032,11 +2032,12 @@ void PreRunInit(const int runmode)
  * but after we dropped privs */
 void PreRunPostPrivsDropInit(const int runmode)
 {
+    StatsSetupPostConfigPreOutput();
+    RunModeInitializeOutputs();
+
     if (runmode == RUNMODE_UNIX_SOCKET)
         return;
 
-    StatsSetupPostConfigPreOutput();
-    RunModeInitializeOutputs();
     StatsSetupPostConfigPostOutput();
 }