core: Tweak startup order.

Move initialization of units which do not require configuration to occur
before preload modules.  This leaves only units which load config between
module preload and regular load stages.

Change-Id: I1d15384acad16a22c3498124421af474fa517478

main/asterisk.c

@@ -4546,20 +4546,7 @@ static void asterisk_daemon(int isroot, const char *runuser, const char *rungrou
 	check_init(ast_device_state_engine_init(), "Device State Engine");
 	check_init(ast_presence_state_engine_init(), "Presence State Engine");
 	check_init(ast_dns_system_resolver_init(), "Default DNS resolver");
-	check_init(load_modules(1), "Module Preload");
-	check_init(ast_features_init(), "Call Features");
-	check_init(dnsmgr_init(), "DNS manager");
 	check_init(ast_security_stasis_init(), "Security Stasis Topic and Events");
-	check_init(ast_named_acl_init(), "Named ACL system");
-
-	ast_http_init();		/* Start the HTTP server, if needed */
-
-	check_init(ast_indications_init(), "Indication Tone Handling");
-	check_init(ast_cdr_engine_init(), "CDR Engine");
-
-	ast_dsp_init();
-	ast_udptl_init();
-
 	check_init(ast_image_init(), "Image");
 	check_init(ast_file_init(), "Generic File Format Support");
 	check_init(load_pbx(), "load_pbx");
@@ -4570,10 +4557,27 @@ static void asterisk_daemon(int isroot, const char *runuser, const char *rungrou
 	check_init(load_pbx_app(), "PBX Application Support");
 	check_init(load_pbx_hangup_handler(), "PBX Hangup Handler Support");
 	check_init(ast_local_init(), "Local Proxy Channel Driver");
+
+	/* We should avoid most config loads before this point as they can't use realtime. */
+	check_init(load_modules(1), "Module Preload");
+
+	/* Initialize core modules that have config files.  These should be converted to
+	 * built-in modules with load priority after realtime, that way users will not
+	 * need to 'preload' realtime modules. */
+	check_init(ast_features_init(), "Call Features");
+	check_init(dnsmgr_init(), "DNS manager");
+	check_init(ast_named_acl_init(), "Named ACL system");
+	ast_http_init();
+	check_init(ast_indications_init(), "Indication Tone Handling");
+	check_init(ast_cdr_engine_init(), "CDR Engine");
+	ast_dsp_init();
+	ast_udptl_init();
 	check_init(ast_cel_engine_init(), "CEL Engine");
 	check_init(init_manager(), "Asterisk Manager Interface");
 	check_init(ast_enum_init(), "ENUM Support");
 	check_init(ast_cc_init(), "Call Completion Supplementary Services");
+
+	/* Load remaining modules */
 	check_init(load_modules(0), "Module");
 
 	/*