dockertest.environment: PEP8/pylint fixes

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
dockertest.environment: Add set_selinux_context and use it for volumes

Docker --volumes requires 'svirt_sandbox_file_t' context. This patch
adds function set_selinux_context and uses it everywhere we create
shared directories with container.

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
dockertest.containers: Check JSON result better

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

* Add better handling of cid
* Fix log messages with kill/remove
* Remove testing paths from default configuration
* Fix cleanup to actually remove containers

Signed-off-by: Chris Evich <cevich@redhat.com>
Merge branch 'volumes' of https://github.com/ldoktor/autotest-docker into containers_verbose

Conflicts:
	subtests/docker_cli/run_volumes/run_volumes.py
	subtests/docker_cli/run_volumes/volumes_one_source.py
Merge pull request #142 from cevich/volumes_selinux

Volumes selinux