Fix node root path in global hooks QA tests
Fix node root path in global hooks QA tests

As the root path is different on a virtual cluster, it is modified with
qa_utils.MakeNodePath.

Signed-off-by: Oleg Ponomarev <c100474c6090841e9d55cde74d38d81efd269b8d@google.com>
Reviewed-by: Lisa Velden <f95ae155456787aef400a49db463a62bbef84ead@google.com>

mbakke/ganeti,leshchevds/ganeti,ganeti/ganeti,ganeti/ganeti,onponomarev/ganeti,leshchevds/ganeti,leshchevds/ganeti,mbakke/ganeti,andir/ganeti,mbakke/ganeti,andir/ganeti,ganeti/ganeti,onponomarev/ganeti,andir/ganeti