implemented reset log levels (#573)

Author: rashtao

core/src/main/java/com/arangodb/ArangoDB.java

@@ -352,6 +352,13 @@ public interface ArangoDB extends ArangoSerdeAccessor {
      */
     LogLevelEntity setLogLevel(LogLevelEntity entity, LogLevelOptions options);
 
+    /**
+     * Reset the server log levels
+     * Revert the server's log level settings to the values they had at startup, as determined by the startup options specified on the command-line, a configuration file, and the factory defaults.
+     * @since ArangoDB 3.12
+     */
+    LogLevelEntity resetLogLevels(LogLevelOptions options);
+
     /**
      * @return the list of available rules and their respective flags
      * @see <a href="https://docs.arangodb.com/stable/develop/http-api/queries/aql-queries/#list-all-aql-optimizer-rules">API

core/src/main/java/com/arangodb/ArangoDBAsync.java

@@ -186,6 +186,11 @@ public interface ArangoDBAsync extends ArangoSerdeAccessor {
      */
     CompletableFuture<LogLevelEntity> setLogLevel(LogLevelEntity entity, LogLevelOptions options);
 
+    /**
+     * Asynchronous version of {@link ArangoDB#resetLogLevels(LogLevelOptions)}
+     */
+    CompletableFuture<LogLevelEntity> resetLogLevels(LogLevelOptions options);
+
     /**
      * Asynchronous version of {@link ArangoDB#getQueryOptimizerRules()}
      */