Use the servers uuid cache in the output to /lp search if LP doesn't have data (#974)

bungee/src/main/java/me/lucko/luckperms/bungee/LPBungeeBootstrap.java

@@ -182,6 +182,19 @@ public class LPBungeeBootstrap extends Plugin implements LuckPermsBootstrap {
         return Optional.empty();
     }
 
+    @Override
+    public Optional<String> lookupUsername(UUID uuid) {
+        if (getProxy().getPluginManager().getPlugin("RedisBungee") != null) {
+            try {
+                return RedisBungeeUtil.lookupUsername(uuid);
+            } catch (Throwable t) {
+                t.printStackTrace();
+            }
+        }
+
+        return Optional.empty();
+    }
+
     @Override
     public int getPlayerCount() {
         return getProxy().getOnlineCount();

bungee/src/main/java/me/lucko/luckperms/bungee/util/RedisBungeeUtil.java

@@ -39,7 +39,11 @@ public final class RedisBungeeUtil {
      * @return a uuid, if present
      */
     public static Optional<UUID> lookupUuid(String username) {
-        return Optional.ofNullable(RedisBungee.getApi()).flatMap(a -> Optional.ofNullable(a.getUuidFromName(username, true)));
+        return Optional.ofNullable(RedisBungee.getApi()).map(a -> a.getUuidFromName(username, true));
+    }
+
+    public static Optional<String> lookupUsername(UUID uuid) {
+        return Optional.ofNullable(RedisBungee.getApi()).map(a -> a.getNameFromUuid(uuid, true));
     }
 
     private RedisBungeeUtil() {}