Clean some javascript

app/static/js/hosts.js

@@ -17,7 +17,10 @@ $(document).ready(function() {
   }
 
   // Populate IP select field on first page load
-  update_available_ips();
+  // Populate vlan_id and prefix select field on first page load
+  if( $("#network_id").length ) {
+    update_available_ips();
+  }
 
   // Update IP select field when changing network
   $("#network_id").on('change', function() {
@@ -39,7 +42,6 @@ $(document).ready(function() {
   // Prefill interface name with hostname
   $("#name").keyup(function(event) {
     var hostname = $(this).val();
-    console.log(hostname);
     $("#interface_name").val(hostname);
   });