dockertest.images: Add default image FQIN property

Simply a convenience, since the majority of the time
callers use ``DockerImage.full_name_from_defaults(self.config)`` and
this class already has access to the subtest configuration.

Signed-off-by: Chris Evich <cevich@redhat.com>
Docker: Add negative usage test

Signed-off-by: Chris Evich <cevich@redhat.com>
subtests: Fix minor exception message typo

Signed-off-by: Chris Evich <cevich@redhat.com>
Merge pull request #204 from cevich/negativeusage

Docker: Add negative usage test
fix dockertest.images regex not include permitted chars

Both hostnames, images names, and tag names may all contain
additional characters which are not present in the '\w' class.

Signed-off-by: Chris Evich <cevich@redhat.com>
docker_cli/create: Test docker 'create' command

Signed-off-by: Chris Evich <cevich@redhat.com>
docs: Fix attribute error in older python 2.7

Signed-off-by: Chris Evich <cevich@redhat.com>
images: Use guaranteed list interface

Signed-off-by: Chris Evich <cevich@redhat.com>