Stress testing of incremental backup

Reasonable stress testing turned out to be a program that does randomized mixes of:

• a range of numbers of tables being modified.
• a mix of table create/rename/drop schema operations.
• operations are mixes of inserts, removes, updates, modify
• checkpoints at various times
• mix of full checkpoints and incremental checkpoints (mostly incremental)

Each run generates a new seed for randomization. The seed used in each run is reported, and the test can be fully reproduced using the same key. By default, there is no other verbose, but it can be turned on with command line option.