Checksum errors after restarting app

[skliper]

Summary scenario

1. Application gets an exception
2. ES restarts the application
3. There is a high probability that the application checksum has changed due to the restart.
4. Checksum is not notified to recompute the application checksum. When it finds the checksum has changed, it puts out an event message to that effect.
5. HS is monitoring for application checksum messages, and does a processor reset as a consequence.

Imported from GSFCCFS-952

[skliper]

Extracted from internal issue history - the checksum change (item 3) was due to the app being reloaded to a new location, but CS was still checksumming the old location. Need to somehow inform CS to checksum the new location.