Add new internal RPI masters to skiapush.json5
Add new internal RPI masters to skiapush.json5

Also:
- Fix sorting
- Fix trailing commas, which break JSON parsing

Bug: skia:6070,skia:7050,skia:5410
Change-Id: I5de72465208c629327df7eb1a2ca730d66c14efe
Reviewed-on: https://skia-review.googlesource.com/123400
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@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