Signed-off-by: Christian Heimes <cheimes@redhat.com>

Make tests pass without presence of requests_gssapi or ipaclient
package.

Signed-off-by: Christian Heimes <cheimes@redhat.com>

The etcd storage plugin was added as a tech demo and proof of concept
to show, how an external database could be used to store secrets. It
hasn't been evolved into a production-ready storage plugin. Further more
it is limited to etcd2 API and not etcd3's new gPRC.

Since it's not usable and causes additional overhead in testing and
downstream packaging, we decided to remove the plugin from the core
distribution.

Signed-off-by: Christian Heimes <cheimes@redhat.com>

- Make dependency on requests_gssapi optional
- Add requests_gssapi to setup.py
- Add simple test case
- Move auth options to mutually exclusive groups

Signed-off-by: Christian Heimes <cheimes@redhat.com>

- use Fedora 27
- include dependencies for custodia.ipa

Signed-off-by: Christian Heimes <cheimes@redhat.com>

Signed-off-by: Christian Heimes <cheimes@redhat.com>

In Python 3, ConnectionError is also a builtin exception. Import and use
the exceptions package from requests to avoid name collision.

Signed-off-by: Christian Heimes <cheimes@redhat.com>

In Python 3, the exception method has the function signature

    def exception(self, msg, *args, exc_info=True, **kwargs):

but Python 2 does not allow that syntax.

Signed-off-by: Christian Heimes <cheimes@redhat.com>

Signed-off-by: Christian Heimes <cheimes@redhat.com>

Issue was found by pylint.

Signed-off-by: Christian Heimes <cheimes@redhat.com>

Tests are failing under 3.4 because IPA packages no longer support 3.4.

Signed-off-by: Christian Heimes <cheimes@redhat.com>

The new feature is breaking tests.

Signed-off-by: Christian Heimes <cheimes@redhat.com>