Display a tool tip with the user's email when you hover an account link

Signed-off-by: Shawn O. Pearce <sop@google.com>

appjar/src/main/java/com/google/gerrit/client/ui/AccountDashboardLink.java

@@ -39,6 +39,7 @@ public class AccountDashboardLink extends DirectScreenLink {
   public AccountDashboardLink(final String text, final AccountInfo ai) {
     super(text, Link.toAccountDashboard(ai));
     addStyleName("gerrit-AccountName");
+    setTitle(FormatUtil.nameEmail(ai));
     account = ai;
   }