ffserver: tests, force +global_header for ASF

Signed-off-by: Reynaldo H. Verdejo Pinochet <reynaldo@osg.samsung.com>

tests/ffserver.conf

@@ -173,6 +173,8 @@ PreRoll 10
 StartSendOnKey
 MaxTime 100
 
+AVOptionVideo flags +global_header
+
 Metadata title "Test data stream"
 
 </Stream>
@@ -195,6 +197,8 @@ PreRoll 20
 StartSendOnKey
 MaxTime 100
 
+AVOptionVideo flags +global_header
+
 Metadata title "Test data stream"
 
 </Stream>