Move close methods out of sql datasource utils class

As noticed by @Gnat008
- We need two different implementations for MySQL and SQLite because SQLite uses an older version where #isClosed is not implemented

src/test/java/fr/xephi/authme/datasource/SqlDataSourceUtilsTest.java

@@ -4,18 +4,12 @@ import fr.xephi.authme.TestHelper;
 import org.junit.Before;
 import org.junit.Test;
 
-import java.sql.Connection;
-import java.sql.ResultSet;
 import java.sql.SQLException;
-import java.sql.Statement;
 import java.util.logging.Logger;
 
 import static org.hamcrest.Matchers.containsString;
-import static org.mockito.ArgumentMatchers.anyString;
-import static org.mockito.Mockito.doThrow;
-import static org.mockito.Mockito.mock;
-import static org.mockito.hamcrest.MockitoHamcrest.argThat;
 import static org.mockito.Mockito.verify;
+import static org.mockito.hamcrest.MockitoHamcrest.argThat;
 
 /**
  * Test for {@link SqlDataSourceUtils}.
@@ -46,90 +40,4 @@ public class SqlDataSourceUtilsTest {
         // then
         verify(logger).warning(argThat(containsString(msg)));
     }
-
-    @Test
-    public void shouldCloseStatement() throws SQLException {
-        // given
-        Statement st = mock(Statement.class);
-
-        // when
-        SqlDataSourceUtils.close(st);
-
-        // then
-        verify(st).close();
-    }
-
-    @Test
-    public void shouldHandleExceptionFromStatement() throws SQLException {
-        // given
-        Statement st = mock(Statement.class);
-        doThrow(SQLException.class).when(st).close();
-
-        // when
-        SqlDataSourceUtils.close(st);
-
-        // then
-        verify(logger).warning(anyString());
-    }
-
-    @Test
-    public void shouldCloseResultSet() throws SQLException {
-        // given
-        ResultSet rs = mock(ResultSet.class);
-
-        // when
-        SqlDataSourceUtils.close(rs);
-
-        // then
-        verify(rs).close();
-    }
-
-    @Test
-    public void shouldHandleExceptionFromResultSet() throws SQLException {
-        // given
-        ResultSet rs = mock(ResultSet.class);
-        doThrow(SQLException.class).when(rs).close();
-
-        // when
-        SqlDataSourceUtils.close(rs);
-
-        // then
-        verify(logger).warning(anyString());
-    }
-
-    @Test
-    public void shouldCloseConnection() throws SQLException {
-        // given
-        Connection con = mock(Connection.class);
-
-        // when
-        SqlDataSourceUtils.close(con);
-
-        // then
-        verify(con).close();
-    }
-
-    @Test
-    public void shouldHandleExceptionFromConnection() throws SQLException {
-        // given
-        Connection con = mock(Connection.class);
-        doThrow(SQLException.class).when(con).close();
-
-        // when
-        SqlDataSourceUtils.close(con);
-
-        // then
-        verify(logger).warning(anyString());
-    }
-
-    @Test
-    public void shouldHandleNullArgument() {
-        // given / when
-        SqlDataSourceUtils.close((Statement) null);
-        SqlDataSourceUtils.close((ResultSet) null);
-        SqlDataSourceUtils.close((Connection) null);
-
-        // then - nothing happens
-    }
-
 }