=per #15671 fix local snapshot store picking up wrong file.

Added spec test to cover fix for bug 15671

Replaced deprecated NamedProcessor with NamedPersistentActor. Cleaned up unused message handling. Typos and misspellings.
Merge pull request #15713 from ktoso/port-fix-local-snapshotstore-recovery-ktoso

=per #15671 fix local snapshot store picking up wrong file (Validation)