Adding oVirt verbs related to host's api

Those verbs are used by ovirt-provision-plugin which introduced as part of feature [1]

[1] http://www.ovirt.org/Features/AdvancedForemanIntegration 
in order to install host it needs to be in maintenance status (in oVirt) - otherwise the operation fails.
I don't see such api in rbovirt at all, how do you do it?