Jenkins: Only switch Nodes when necessary

Same node is switched in and out for several times in a single job,
which is actaully unnecessary and has a bad influence on the CI job
performance.

It is more reasonable to have all stages in one job to be processed in
one node.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I938b539923ed3a63e273bf6f3cc565057884d96c
1 file changed