Revert "CFY-557 remove processing event"

This reverts commit d24833a872e5d2cfa0e83b5410b2b97cc03f2da5.
Revert "CFY-557 remove debug events"

This reverts commit 2fa908d99e9da5f9cc553b5ecb76949d8d8c122e.
Revert "CFY-557 change install to use node batches and only pass node_id in workitem fields, not the entire node"

This reverts commit 7d63e2b8ae4ec58ed3c08dd3da7b917c4bd00969.
CFY-577 test with 1 unicorn worker