Fixed in JDBConn::SetParam and adding java function SetNullParm.
  modified:   storage/connect/jdbconn.cpp
  modified:   storage/connect/JdbcInterface.java
  modified:   storage/connect/mysql-test/connect/disabled.def
  modified:   storage/connect/mysql-test/connect/r/jdbc_new.result
  modified:   storage/connect/mysql-test/connect/std_data/JdbcMariaDB.jar

- MDEV-11067 suggested to add configuration support to the Apache wrapper.
  Uncommented out to test if it works.
  modified:   storage/connect/CMakeLists.txt
  added:      storage/connect/ApacheInterface.class
  added:      storage/connect/JdbcInterface.class
  added:      storage/connect/MariadbInterface.class
  added:      storage/connect/MysqlInterface.class
  added:      storage/connect/OracleInterface.class
  added:      storage/connect/PostgresqlInterface.class