vsftp 3.0 allows chrootUsers activation

After running new anste tests for FTP with the same fix I did for master branch I found that 3.2 and later are really working with FTP chrootUser option, so this is an adaptation of the change done for the master branch:

	Zentyal FTP tests
		ConfigNetSetExternal: OK
		InstallFTP: OK
		EnableModules: OK
		AddUser: OK
		ConfigFTPNonSSLNonAnonymous: OK
		TestPut: OK
		TestGet: OK
		TestPwd: OK
		ConfigFTPNonSSLAnonymousReadWrite: OK
		TestPutAnonymous: OK
		TestGetAnonymous: OK
		ConfigFTPNonSSLAnonymousReadOnly: OK
		TestPutAnonymousReadOnly: OK
		TestGetAnonymousReadOnly: OK
		ConfigFTPNonSSLNonAnonymousWithChroot: OK
		TestPut: OK
		TestGet: OK
		TestPwd: OK
		check-zentyal-log: OK
		check-syslog-apparmor: OK