* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* MM-15064: allow running with future minor db versions
This is to support running another community cluster that stays on the most recent stable version while we test upcoming versions.
During the past few releases, we have committed to not making backwards incompatible schema changes across minor versions. This means that a 5.x server can run against any 5.y schema, y >= x. (It will upgrade to x if y < x).
* check errors on incoming versions vs. Must/panic
* fix TestSaveSchemaVersion
