TOOLS-4263 Convert mongorestore replica-set oplog-replay tests to Go

[autarch]

This adds a new TestOplogReplayFromLocalOplogRS test in mongorestore/oplog_replset_test.go. This ports two JS tests into one Go test. It dumps local.oplog.rs with a $gt timestamp query and replays the dump via --oplogReplay --oplogFile ..., verifying only the ops after the checkpoint are applied.

JS -> Go mapping:

• test/qa-tests/jstests/restore/oplog_replay_local_rs.js -> the
  --oplogReplay --oplogFile replay of a dumped local/oplog.rs.bson
• test/legacy42/jstests/tool/dumprestore7.js -> the mongodump of
  local.oplog.rs with a {ts:{$gt:...}} timestamp query

[autarch]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• TOOLS-4263 Convert mongorestore replica-set oplog-replay tests to Go #1049 👈 (View in Graphite)
• TOOLS-4263 Convert mongorestore oplog-replay edge-case tests to Go #1060
• TOOLS-4263 Convert mongorestore invalid-input tests to Go #1046 : 1 other dependent PR (#1048 )
• TOOLS-4263 Delete JS tests fully covered by existing Go tests #1041
• TOOLS-4263 Add a Go test that we preserve indexes when restoring with a non-admin user on a per-data basis #1047
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.