changed run_volumes to run as a subsubtest for later expansion

Signed-off-by: James Molet <jmolet@redhat.com>
fixed whitespace

Signed-off-by: James Molet <jmolet@redhat.com>
docker tests: adds history test.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
docker test: run pull only once.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
dockertest.xceptions: Fix non-defaulting param bug.

When autotest tries to pickle/unpickle exceptions,
it requires all exception parameters accept defaults
before it will re-raise them with correct parameters.
Added some sensible default values for the one exception
that was causing the most trouble.

Signed-off-by: Chris Evich <cevich@redhat.com>
subtests...run_volumes: pep8 fixes

Real pep8 work done by jzupka@redhat.com

Signed-off-by: Chris Evich <cevich@redhat.com>
made error message clearer when no subsubtests are enabled

Signed-off-by: James Molet <jmolet@redhat.com>