oeqa/selftest/signing: Allow tests not to need gpg on the host

We ideally don't want to use gpg from the host. This is straightforward for package
management but not for sstate.

For sstate, create a second build directory to run the test in using gnupg-native
from the original build directory.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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