tests: Add missing encrypted sample, cleanup samples handling.
* tests/openpgp/Makefile.am (TEST_FILES): Add new file. * tests/openpgp/defs.scm (plain-files): Add 'plain-large'. (all-files): New variable. (create-sample-files): New function. (create-legacy-gpghome): Use new function. * tests/openpgp/plain-large.asc: New file.
- Signed-off-by: Justus Winter <justus@g10code.com>