Puppet modules improved to support multiple clusters of VCenter.

Because puppet module inifile does not support the same option names in one section,
settings of compute service for vmware moved to a separate file (/etc/nova/nova-compute.conf),
which is generated from erb template.

Partially implements: blueprint vcenter-hv-full-scale-support
Change-Id: I6e9ac50e77400ac1abb3687e38ce768386270714
Merge "Puppet modules improved to support multiple clusters of VCenter."