Use "ecatf" as the protocol name, to parallel everything else.

The fields have names beginning with "ecatf.", the dissector is called
"ecatf", and it's only the frame layer of EtherCAT anyway, so just call
it "ecatf".

Change-Id: I2f127363fd115c307f0525f612fe184a30d46c55
Reviewed-on: https://code.wireshark.org/review/17406
Reviewed-by: Guy Harris <guy@alum.mit.edu>

plugins/ethercat/packet-ethercat-frame.c

@@ -130,7 +130,7 @@ void proto_register_ethercat_frame(void)
       };
 
    proto_ethercat_frame = proto_register_protocol("EtherCAT frame header",
-                                                  "ETHERCAT","ethercat");
+                                                  "ETHERCAT","ecatf");
    proto_register_field_array(proto_ethercat_frame,hf,array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));