Modify ostf.pp to use fuel-ostf package

* Replace installtion of two ostf packages for one fuel_ostf
* Add savana murana tests dependency

Partly Fixes: OSTF-237
forgotten directive
Merge pull request #612 from Mirantis/ubuntu-netif-directive

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Merge pull request #590 from tleontovich/OSTF-237

Modify ostf.pp
move delimiter due to cobbler parser
Merge pull request #613 from Mirantis/cobbler-net

move delimiter due to cobbler parser bug