The stock anaconda template previously lacked any ability
to indicate "don't validate the tls certificate".
The capability for the installation to operate *without*
requiring this to be the case is necessary for efficient
and simple CI testing as injecting CA certificates is
an overly complex interaction for CI testing.
Also updates the overall anaconda documentation to indicate
the constraint exists, but does not indicate explicitly how
to disable the setting via ironic.conf.
Change-Id: Ia8e4320cbedb205ab183af121da53562792a8faa
e75626392b