xci: run-functest: Add required functest packages

xci: run-functest: Add required functest packages

The package requirements are the same across distros so
we simply hardcode them in the task. Fixes the following problem:

fatal: [opnfv]: FAILED! => {"changed": true, "cmd":
"/root/run-functest.sh", "delta": "0:00:09.150226", "end": "2018-01-26
14:01:18.758704", "failed": true, "rc": 125, "start": "2018-01-26 1
4:01:09.608478", "stderr": "/root/run-functest.sh: line 14: wget:
command not found

Change-Id: Ib07acac18f8ece1111ee0706766f32005d0ac1da
Signed-off-by: Markos Chandras <mchandras@suse.de>