Currently some functions call node._to_munch, some - _normalize_machine,
some both. When only _normalize_machine is used, the machine's fields
are not normalized to their server-side representation, breaking
the os_ironic ansible module expecting node['uuid'].
This change makes _normalize_machine call _to_munch to ensure that
normalization always happens. All cloud calls are changed to use
_normalize_machine and not _to_munch.
Change-Id: Ic431f1340c017a24eafe07832da6e6c579fb1921
(cherry picked from commit 5db3323be1)
6dcb309e0f