Add auto-completer for add-host-intent command (ONOS-1756)

Change-Id: I6a3c34ef8c9829b2361d6ea96e94b9d7cc830db8

@@ -144,6 +144,11 @@
                 <null/>
             </completers>
             <optional-completers>
+                <entry key="-t" value-ref="ethTypeCompleter"/>
+                <entry key="--ipProto" value-ref="ipProtocolCompleter"/>
+                <entry key="--icmp6Type" value-ref="Icmp6TypeCompleter"/>
+                <entry key="--icmp6Code" value-ref="Icmp6CodeCompleter"/>
+                <entry key="--extHdr" value-ref="ExtHeaderCompleter"/>
                 <entry key="-a" value-ref="allAppNameCompleter"/>
             </optional-completers>
         </command>