arp(8): add support for printing and deleting entries of type

IFT_INFINIBAND, used in IPoIB.

PR:		151594
Submitted by:	Anthony Cornehl <accornehl@gmail.com>
Reviewed by:	hselasky
MFC after:	1 week
Sponsored by:	EMC / Isilon Storage Division

usr.sbin/arp/arp.c

@@ -282,6 +282,7 @@ valid_type(int type)
 	switch (type) {
 	case IFT_ETHER:
 	case IFT_FDDI:
+	case IFT_INFINIBAND:
 	case IFT_ISO88023:
 	case IFT_ISO88024:
 	case IFT_ISO88025:
@@ -656,6 +657,9 @@ print_entry(struct sockaddr_dl *sdl,
 	case IFT_BRIDGE:
 		printf(" [bridge]");
 		break;
+	case IFT_INFINIBAND:
+		printf(" [infiniband]");
+		break;
 	default:
 		break;
         }