Merge 'EvacNode' and 'NodeEvacMode'
Merge 'EvacMode' and 'NodeEvacMode' which are associated with the duplicated constants 'IALLOCATOR_NEVAC_*' and 'NODE_EVAC_*'. This merge moves the type 'EvacMode' to 'Ganeti.Types' in order to avoid a circular dependency between 'Ganeti.HsConstants' and 'Ganeti.HTools.Types'. The type 'EvacMode' is preferred to the type 'NodeEvacMode' given that its use is more widespread. Signed-off-by: Jose A. Lopes <firstname.lastname@example.org> Reviewed-by: Klaus Aehlig <email@example.com>