Revert "change jdbcPluginName required to true for Mysql"

This reverts commit 2b806ad.

Author: sumengwang

mysql-plugin/src/main/java/io/cdap/plugin/mysql/MysqlConnectorConfig.java

@@ -16,14 +16,9 @@
 
 package io.cdap.plugin.mysql;
 
-import io.cdap.cdap.api.annotation.Description;
-import io.cdap.cdap.api.annotation.Macro;
-import io.cdap.cdap.api.annotation.Name;
-import io.cdap.plugin.db.ConnectionConfig;
 import io.cdap.plugin.db.connector.AbstractDBSpecificConnectorConfig;
-import java.util.Properties;
-import javax.annotation.Nullable;
 
+import java.util.Properties;
 
 /**
  * Configuration for Mysql Connector
@@ -41,15 +36,10 @@ public MysqlConnectorConfig(String host, int port, String user, String password,
     this.port = port;
     this.user = user;
     this.password = password;
+    this.jdbcPluginName = jdbcPluginName;
     this.connectionArguments = connectionArguments;
   }
 
-  @Name(ConnectionConfig.JDBC_PLUGIN_NAME)
-  @Description("Name of the JDBC driver to use. This is the value of the 'jdbcPluginName' key defined in the JSON " +
-          "file for the JDBC plugin.")
-  @Macro
-  private String jdbcPluginName;
-
   @Override
   public String getConnectionString() {
     return String.format(MYSQL_CONNECTION_STRING_FORMAT, host, getPort());
@@ -60,11 +50,6 @@ public int getDefaultPort() {
     return 3306;
   }
 
-  @Override
-  public String getJdbcPluginName() {
-    return jdbcPluginName;
-  }
-
   @Override
   public Properties getConnectionArgumentsProperties() {
     Properties prop = super.getConnectionArgumentsProperties();