NoNewGlobals for OpenSSL-related structures (#2006)

NoNewGlobals for OpenSSL-related structures (#2006)

These changes were anticipated in Bug 5390 fix (recent commit c565067):
https://bugs.squid-cache.org/show_bug.cgi?id=5390#c16

They eliminate all known OpenSSL-related globals:

* Security::ProxyOutgoingConfig
* Ssl::SquidUntrustedCerts
* Ssl::TheGeneratorRequests
* Ssl::TheGlobalContextStorage

Also applied AAA and range-based `for` loop upgrades to modified lines.