tests: Allow using run-sign to test loopback pinentry problems.
tests: Allow using run-sign to test loopback pinentry problems.

* tests/run-sign.c: Add options --status and --loopback.

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme