tests: Create separate hardware tests

 * The setup-softhsm2 script goes through the whole setting of
   environment, soft token, generating testing keys, certificates and
   running the test suite.

 * These tests are supposed to run against existing CAC card
   connected to local computer, which should be presenting
   certificates with 1024 b keys.

 * These tests are skipped in case there is no card available.

 * This also extends the existing testsuite with tests for
   various empty applets

 * The NSS DB needs to be created under tests/hwdb/ and local
   pkcs#11 module needs to be added to the database

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Robert Relyea <rrelyea@redhat.com>
[ Marc-André - various fixes for make check & distcheck ]
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>