Fixed small glitch highlighting matched text in principal search

In case the query for principals contains a domain (e.g. user@domain),
the search is done just for "user" in the specific domain so multiple
principals can be found and the highlighted matched text should be just
"user" instead of the whole "user@domain".

Change-Id: I2c53dcf1d4b8e5d6b55da1f8c67275318c1f38fa
Reviewed-on: http://bellevue-ci.eng.vmware.com:8080/22802
Reviewed-by: Stanislav Hadjiiski <hadjiiskis@vmware.com>
Reviewed-by: Antonio Filipov <afilipov@vmware.com>
Closures-Verified: jenkins <jenkins@vmware.com>
Upgrade-Verified: jenkins <jenkins@vmware.com>
Bellevue-Verified: jenkins <jenkins@vmware.com>
CS-Verified: jenkins <jenkins@vmware.com>

ui/common/src/components/common/SimpleSearch.js

@@ -32,6 +32,13 @@ module.exports = class SimpleSearch {
         suggestion: function(context) {
           var name = context.name || '';
           var query = context._query || '';
+
+          var queryAtIndex = query.lastIndexOf('@');
+          if (queryAtIndex > 0) {
+            // ignore everything after the last '@' in case of query@domain searches
+            query = query.substring(0, queryAtIndex);
+          }
+
           var start = name.indexOf(query);
           var end = start + query.length;
           var prefix = '';