* whitesourceExecuteScan - fix stashing behavior for golang
**changes:**
golang scan requires sources to be present. They are already part of the `checkmarx` stash which can be used here.
* fix tests
* handlePipelineStepErrors - allow step timeouts
This adds another resilience option:
A timeout can be configured for steps in order to stop step execution, continue with the pipeline while setting build status to "UNSTABLE"
* Define pod using k8s yaml manifest
The Kubernetes plugin allows to define pods directly via the Kubernetes
API specification:
https://github.com/jenkinsci/kubernetes-plugin#using-yaml-to-define-pod-templates
This has the advantage of unlocking Kubernetes features which are not
exposed via the Kubernetes plugin, including all Kubernetes security
featues.
Using the Kubernetes API directly is also better from development
point of view because it is stable and better desgined then the API the
plugin offers.
* Make the Kubernetes ns configurable
If one Jenkins Master is used by multiple Teams, it is desirable to
schedule K8S workloads in seperatae workspaces.
* Add securityContext to define uid and fsGroup
In the context of the Jenkins k8s plugin it is uids and fsGroups play an
important role, because the containers share a common file system.
Therefore it is benefical to configure this data centraly.
* fix indention
* Undo format changes
* Extend and fix unit tests
* Fix port mapping
* Don't set uid globally
This does not work with jaas due to permissions problems.
* Fix sidecar test
* Make security context configurable at stage level
* Extract json serialization
* Cleanup unit tests
