R1:b5897ec9c071

Add dry-run, max version options to upgrade_schema.php script

Summary:
1) Dry run option allows you to run the script to see what patches would get
applied (without actually applying them).
2) Max version allows you to do a partial upgrade.

Task ID: #

Blame Rev:

Test Plan:
ran a dry run twice (to make sure it didn't do anything) and no max version
ran with a dry run and max version to check max version logic works correctly
ran with just a max version, and only patches up to that point got applied…