Description of problem:
No new parameters like 'HostsInReserve' for power saving cluster policy in REST

Version-Release number of selected component (if applicable):
av2

How reproducible:
Always

Steps to Reproduce:
1. Change cluster policy to power saving and add new parameter(for example 'EnableAutomaticHostPowerManagement')
2.
3.

Actual results:
No new parameter appear in REST under cluster policy

Expected results:
Parameter appear with correct value, for example:
<scheduling_policy>
<policy>power_saving</policy>
<thresholds low="20" high="80" duration="120"/>
<hosts_in_reserve>3</hosts_in_reserve>
<enable_automatic_host_power_management>true</enable_automatic_host_power_management>
</scheduling_policy>

Additional info:
Effected parameter 'HostsInReserve', 'EnableAutomaticHostPowerManagement' and 'ScaleDown'.
Also I can't add 'ScaleDown' parameter, when I create new cluster policy, no matter what balance function I choose, so how I understand this parameter not connect to any balance functions, so why I can add it, under PowerSaving or EvenDistribution when I choose cluster policy?