Revert "[bootstrap] fix: fixed required variable validation assertion"

[gregmulvaney]

Reverts #1074

I made a mistake on testing this PR.

The Jinja default() filter does not play nice with boolean variables. Any false-y variables ( e.g. bootstrap_ipv6_enabled: false ) will fail the assertion.

Without setting the default filters boolean paramater to true the filters scope is limited strictly to Undefined which Ansible does not seem to assign to variables that are... undefined.

def do_default(value, default_value=u'', boolean=False):
    """If the value is undefined it will return the passed default value,
    otherwise the value of the variable:

    .. sourcecode:: jinja

        {{ my_variable|default('my_variable is not defined') }}

    This will output the value of ``my_variable`` if the variable was
    defined, otherwise ``'my_variable is not defined'``. If you want
    to use default with variables that evaluate to false you have to
    set the second parameter to `true`:

    .. sourcecode:: jinja

        {{ ''|default('the string was empty', true) }}
    """
    if isinstance(value, Undefined) or (boolean and not value):
        return default_value
    return value

[onedr0p]

Thanks for looking into this, bummer it doesn't play the way we want it to.