If a phase is started successfully, it needs to be stopped as well. In
most cases when `stop` is called immediately after `start`, this is not
a problem.
Only when something else happens while a phase is runnning and this
something fails, Pungi will deadlock and never exit. This something
could be another phase or just main thread raising an exception.
Fixes: #625
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
The live_images, live_media and image_build phases have same options
that need to be specified on each image. This leads to a lot of
duplication in the config file. This patch adds global settings and
phase-level settings that allow to significantly reduce duplication.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
