Add --ignore-hold to upgrade script which can install "kept back" packages during install

Need testing, high priority
5 jobs for master
Status Name Job ID Coverage
  Test Source
failed test-source-lts #5491

failed test-source-rolling #5492

 
  Build
skipped build-rolling-amd64 #5495
skipped lintian-lts #5493
skipped lintian-rolling #5494
 
Name Stage Failure
failed
test-source-rolling Test Source There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
test-source-lts Test Source There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log