Upgrade script used to remotely get Skolo to Debian10.
Upgrade script used to remotely get Skolo to Debian10.

A bit rough, since they had different quirks, and some steps sometimes harmlessly fail.
But it generally worked.

Bug: skia:9438
Change-Id: I493b720d2762f6256ea90a2c9bf57e285aef2d89
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/281214
Commit-Queue: Weston Tracey <e7e27cb74e46abd7b999223aa4f27901ab7e58c6@google.com>
Auto-Submit: Weston Tracey <e7e27cb74e46abd7b999223aa4f27901ab7e58c6@google.com>
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot