HttpURLConnection cache issues leading to crashes in JGSS w/ native GSS introduced by 8303809

[Nico Williams]

Also, a colleague informs me that 17.0.5 (as packaged by Debian) w/o `-Djdk.spnego.cache=false` doesn't exhibit the double-free/use-after-free crashes (as expected), but:

> I do see some "Authentication failure" / and "java.lang.NullPointerException: Cannot invoke "sun.net.www.protocol.http.Negotiator.nextToken(byte[])" because "this.negotiator" is null".

That seems to support the idea that the `AuthCache` is harmful.

Nico
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