mysql: bug fixes (uber#1195)

Bugfix: timer queue active processor missing return err (uber#1000)

Handle deletion of task during failover (uber#976)

* Adding failover info persistence struct
* Adding awareness of failover info during transfer / timer task cleanup

Note: missing persistence to database, the persistence to database of
failover cursor should be done along with balk failover for performance.

V0.3.12 patch (uber#829)

* make transfer / timer / replication persistence layer accept page token

* get task API on the cassandra side should use page size, not limit

* apply pagination token to timer ack manager

* move duplicated transfer code to one place

* modify test to force pagination

* bugfix: queue ack manager should call processor's complete task fn

* do not keep the lock when doing query

Bugfix, reset mutable state empty UUID (uber#784)

* add .vscode to .gitignore

* bugfix: empty uuid in reset mutable state

bugfix: mutable state should be reset if the operation is not success… (

uber#667)

hotfix issue uber#658

Update docker image with latest cadence release (uber#614)

Fix config template to include new required config changes to bring up
the Cadence server.

Revert "history service should do event reordering making sure corres…

…ponding … (uber#601)" (uber#611)

This reverts commit 6164b73.

bugfix: parent workflow, when signaling child workflow, can experienc… (

uber#607)

* bugfix: parent workflow, when signaling child workflow, can experience deadlock, if child workflow, at the same time, is completed.

* bugfix: handling workflow using decision to cancel itself.