test: reply (in cli and emacs) should protect indexed sensitive headers

test: reply (in cli and emacs) should protect indexed sensitive headers

These tests are currently broken!  When a protected subject is indexed
in the clear, it leaks in the reply headers :(

For emacs, we set up separate tests for when the protected header is
indexed in the clear and when it is unindexed.  neither case should
leak, but the former wasn't tested yet.

We will fix the two broken tests in a subsequent patch.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>