Bug 1870262 - a subdomain of any HSTS superdomain that asserts...

Bug 1870262 - a subdomain of any HSTS superdomain that asserts includeSubdomains is HSTS (ESR115) r=jschanck, a=dmeehan


Previously, the HSTS implementation would only consider the first superdomain
that had any HSTS information and use the presence or absence of the
includeSubdomains directive to determine if the subdomain was HSTS. However,
the specification actually stipulates that if any superdomain that is HSTS
asserts includeSubdomains, the subdomain is HSTS.

Differential Revision: https://phabricator.services.mozilla.com/D197550