FYI: AccessController.getContext() checks extended

[Gary Benson <gbenson at redhat dot com>]

Hi all,

This commit extends the AccessController.getContext() checks I wrote
on Tuesday.  The original test checked that the returned context
contained all protection domains in the call stack.  With this commit
it also checks that the returned context does not contain protection
domains masked by calls to AccessController.doPrivileged().  This is
actually what I was trying to achieve the other day before the lethal
cocktail of heat, reflection and the AccessController Javadoc overcame
me.

Cheers,
Gary

PS If there's a competition for the most insane testcase then this is
my entry.

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