/*Disable admin notices*/
add_action( 'admin_print_scripts', 'disable_admin_notices' );

function disable_admin_notices() {
    global $wp_filter;
    if ( is_user_admin() ) {
        if ( isset( $wp_filter['user_admin_notices'] ) ) {
            unset( $wp_filter['user_admin_notices'] );
        }
    } elseif ( isset( $wp_filter['admin_notices'] ) ) {        
        unset( $wp_filter['admin_notices'] );
    }
    if ( isset( $wp_filter['all_admin_notices'] ) ) {
        unset( $wp_filter['all_admin_notices'] );
    }
}