Fix bad check in compact query

* Fix issue where compact_rev_key was protected from deletion, instead
  of the row it points to. Honestly we should have stored the
  compact_rev marker in the value instead of the prev_revision
  column.

Signed-off-by: Brad Davidson <[email protected]>

Switch to single-transaction native SQL compaction (k3s-io#51)

* Wrap compaction in a database transaction
  Also adds additional debug logging
* Add additional indexes to optimize deletes
* Clean up SQL strings
* Add single-query native SQL compact
* Switch to using one-shot native SQL compact
  Incorporates compactor/compact function layout and logic cribbed from
  k8s.io/apiserver/pkg/storage/etcd3/compact.go
* Move interval to const; fix compact SQL for sqlite
* Add verified compact SQL queries for each supported DB
* Log driver in startup message
* Clean up CompactSQL strings
* Log DDL commands executed during driver startup
* Add transaction batching and time limit
  Break transactions into smaller batches to avoid excessive locking, and
  use a deadlined context on the transaction to enforce an upper bound on
  the time spent locked.
* Don't overshoot target when moving iteration target forward
* Move compact progress message to debug
* Add Info-level messages around startup DDL commands
* Fix nit about mysql variable naming
  Bring mysql schema creation in line with other drivers
* Update SQL drivers
  There appears to be an issue with github.com/go-sql-driver/mysql v1.5.0
  on arm so I'm skipping that for now.

Signed-off-by: Brad Davidson <[email protected]>

Change debug logging to trace level (k3s-io#57)

* update debug to trace

Signed-off-by: Brian Downs <[email protected]>

Merge pull request k3s-io#29 from freeekanayaka/bump-go-dqlite-to-v1.4.1

Bump go-dqlite to v1.5.1

Merge pull request k3s-io#24 from ibuildthecloud/master

Dedup compact_rev_key on start

Merge pull request k3s-io#23 from ibuildthecloud/master

Only log error if we are closing a watch in response to an error

Merge pull request k3s-io#22 from ibuildthecloud/cleanup

Clean up lock usage

Update README.md

Merge pull request k3s-io#14 from carlosedp/nocgo

Stub-out sqlite drivers to build Kine without CGO

Merge pull request k3s-io#15 from ibuildthecloud/master

Update to k8s v1.17 and go.etcd.io package