pytest-order contains a fix for parameterized tests in 1.0, but
that version dropped support for Python 3.5. This patched version
runs on Python 3.5 and has all the other updates in pytest-order 1.0.
- first pass super basic integration test separation
- BCPG decryption tests now pass so removed XFAIL marker
- remove unused imports
- added some warning filtering to reduce noise
- added missed call to _compute.chksum in ECDSAPriv
- replaced all gpg wrapper fixtures in the unit test suite with gpg package
- moved test suite gnupghome location to tests/gnupghome
