Remove most unused references to CONFIG_NET_MULTICAST. Rename other uses of...

Remove most unused references to CONFIG_NET_MULTICAST.  Rename other uses of CONFIG_NET_MULTICAST to avoid naming comflicts.

arch @ 2c6b8579

-Subproject commit 38d940d253cac5b5d9fbe014051789efb2ff2d5d
+Subproject commit 2c6b85793f26fb265e88ff2fc3d4e71707f9ab2b

configs @ 43699493

-Subproject commit f5cb53174df1ed2e0669fc9295c8e52f424c7d5b
+Subproject commit 43699493840f36a03a7aed7f9bd78eab9e0770e6

net/Kconfig

@@ -288,12 +288,6 @@ config NET_STATISTICS
 
 source "net/route/Kconfig"
 
-config NET_MULTICAST
-	bool "Multi-cast Tx support"
-	default n
-	---help---
-		Outgoing multi-cast address support
-
 config NET_HOSTNAME
 	string "Host name for current machine"
 	default ""