A more convenient way to checkout the project sources. The idea is to
have a Jenkinsfile in the payload repository that only loads the shared
library and then runs this step. This step in turn loads a Jenkinsfile
from another repository.
The repo url, branch, Jenkinsfile path and credentials ID can be
provided to the step. The Jenkinsfile is first checked out to a
temporary folder, before it is loaded.
The payload repo must include a Jenkinsfile to be loaded with this
approach.
Without proper quotation characters with a special semantics
on shell level (e.g. "${}", "!", """ gets escaped on shell level
before handed over to the neo tool.
neoExecutable is surrounded by double quotes since we may have
shell ${variables} inside the groovy variable.
All other variables (user, host, account, password) are surrounded
by single quotes since we do not expect to be variables used here.
The neoExecutable is
