add send-presence-on-register (true|false|first-only) param to sofia and api command sofia global debug [presence|sla|none]

src/mod/endpoints/mod_sofia/mod_sofia.h

@@ -225,6 +225,8 @@ typedef enum {
 	PFLAG_DEL_SUBS_ON_REG,
 	PFLAG_IGNORE_183NOSDP,
 	PFLAG_PRESENCE_PROBE_ON_REGISTER,
+	PFLAG_PRESENCE_ON_REGISTER,
+	PFLAG_PRESENCE_ON_FIRST_REGISTER,
 	PFLAG_NO_CONNECTION_REUSE,
 	/* No new flags below this line */
 	PFLAG_MAX