Changes

Jenkinsfile: move static and cross compilation to unit-validate stage
Signed-off-by: Tibor Vass <tibor@docker.com>

hack: unmount leftover daemon root folders
Signed-off-by: Tibor Vass <tibor@docker.com>

Jenkinsfile: reduce time of integration tests by dividing tests into 3
parallel runs
Signed-off-by: Tibor Vass <tibor@docker.com>

add powerpc-master stage to Jenkinsfile
The powerpc-master stage will just run the integration-cli tests. The 
existing powerpc stage will run the unit tests and the integration 
tests. In this way, PR check jobs will be shorter, but all integration 
tests will run after PR is merged to master.
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

add z-master stage to Jenkinsfile
The z-master stage will just run the integration-cli tests. The existing
z stage will run the unit tests and the integration tests. In this way,
PR check jobs will be shorter, but all integration tests will run after
PR is merged to master.
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

set timeouts in Jenkinsfile to 2 hrs
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

use environment for power jobs in Jenkinsfile
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

use environment for z jobs in Jenkinsfile
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

be more lenient on junit report gathering in Jenkinsfile
In case a job fails before even generating a report file.
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

rename z bundles in Jenkinsfile
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

rename powerpc bundles in Jenkinsfile
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

fix bundles filenames in Jenkinsfile
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

fix some spelling mistakes
Signed-off-by: SataQiu <qiushida@beyondcent.com>

Jenkinsfile: send junit.xml in the stage that produced it
This will send the results directly after the tests complete, and make
the stage more atomic.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Jenkinsfile: collect junit.xml for all architectures
Jenkins groups them per stage, so collecting them for all architectures 
is possible (without them conflicting or becoming ambiguous)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Jenkinsfile: run DCO check before everything else
This will run the DCO check in a lightweight alpine container, before 
running other stages, and before building the development
image/container
(which can take a long time).
A Jenkins parameter was added to optionally skip the DCO check
(skip_dco)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>