FS-11646: Improved support for ICE-lite

Specifically:
* Send the a=ice-lite SDP attribute as a session-level attribute
* Suppress sending STUN connectivity checks when enabled
* Make sure FS is the controlled entity if it is declaring ICE-lite

src/include/switch_types.h

@@ -2642,7 +2642,8 @@ typedef enum {
 typedef enum {
 	ICE_GOOGLE_JINGLE = (1 << 0),
 	ICE_VANILLA = (1 << 1),
-	ICE_CONTROLLED = (1 << 2)
+	ICE_CONTROLLED = (1 << 2),
+	ICE_LITE = (1 << 3)
 } switch_core_media_ice_type_t;
 
 typedef enum {