network ftp: some cleanup

* Move do_setup and do_cleanup into ftp_setup.

* Delete ftp02_s1 and add do_test function for it.

* Delete ftp_set_passwd and ftp_setup_vsftp_conf, since they are not be used.

* Use test.sh instead of net_cmdlib.sh

* Abandon trap and use tst_exit.

* Make the test like:
	(set TCID TST_TOTAL ...)
	setup
	do_test
	check_result
	tst_exit

* Some cleanup.

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
Acked-by: Alexey Kodanev <alexey.kodanev@oracle.com>
network ssh: some cleanup

* Move do_setup and do_cleanup into the file of ssh_setup.

* Use test.sh instead of net_cmdlib.sh

* Abandon trap and use tst_exit.

* Make the test like:
	(set TCID TST_TOTAL ...)
	setup
	do_test
	check_result
	tst_exit

* Some cleanup.

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
Acked-by: Alexey Kodanev <alexey.kodanev@oracle.com>