tests: Fix no gpg-agent upon removal of GNUPGHOME.
83529e1bd14a
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Description

tests: Fix no gpg-agent upon removal of GNUPGHOME.

* tests/gpgscm/gnupg.scm (with-ephemeral-home-directory): Add
teadown-fn.
* tests/gpgsm/export.scm: Use -no-atexit version and stop-agent.
* tests/openpgp/decrypt-session-key.scm: Likewise.
* tests/openpgp/decrypt-unwrap-verify.scm: Likewise.
* tests/openpgp/defs.scm (have-opt-always-trust): Likewise.
(setup-environment-no-atexit): New.
(start-agent): Support no use of atexit.
* tests/gpgsm/gpgsm-defs.scm (setup-gpgsm-environment-no-atexit): New.
* tests/migrations/common.scm (untar-armored): Follow the change
of with-ephemeral-home-directory.

When gpg-agent detects homedir removal, it will automatically exit.
Then, call of 'gpgconf --kill all' will fail. So, stop-agent should
be called before the removal of homedir.