spec: comment out the stages in Jenkinsfile
spec: comment out the stages in Jenkinsfile

Every patch set doens't need to be wasting time on all test
stages until they are stable and reporting results.

Change-Id: I8d654275350687baa1986d7f068aa701125c868d
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/213569
Tested-by: Jenkins
Reviewed-by: Robert Lamb <bf934bf7cdbebe5899399a138c0cb75c4d783999@instructure.com>
QA-Review: James Butters <4c5a489c9bb72d41f20b3b22aaf4c9b864e32f20@instructure.com>
Product-Review: James Butters <4c5a489c9bb72d41f20b3b22aaf4c9b864e32f20@instructure.com>

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