restapi: adding cpu profile to VM and template

Allowing setting optional value cpu_profile.id into
VM and Template elements.

Change-Id: Ifef1442476ecde490414ae625ced333d1e9e6259
Bug-Url: https://bugzilla.redhat.com/1084930
Signed-off-by: Gilad Chaplik <gchaplik@redhat.com>