Outdated version dependencies on GnuPG 2.0 in epg-tests.el?

[Jens Schmidt]

The following test


https://git.savannah.gnu.org/cgit/emacs.git/tree/test/lisp/epg-tests.el?h=master

has some fixmes and describes restrictions related to GnuPG 2.0, in
particular on Hydra CI.

According to the GnuPG NEWS the first GnuPG 2.1 release dates back to
2014.  So probably these restrictions are outdated and could be lifted,
at least in master?

I'm asking for two reasons:

1. I could provide fixes to lift the restrictions.

2. I'd like to write tests for plstore, which uses EPG as backend, and
   do not want to introduce such version dependencies if it can be
   avoided.

Thanks