Engine should not call method from cyclone server

[cd1989]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind bug

Workflow Engine is lower level component of Cyclone, it should not be aware of Cyclone Server logic. So call method of Cyclone server is not allowed.

So this is not allowed:

https://github.com/caicloud/cyclone/blob/master/pkg/workflow/controller/handlers/workflowtrigger/cron_job.go#L19

What happened:

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

[supereagle]

Should also consider the common package, like https://github.com/caicloud/cyclone/blob/master/pkg/workflow/controller/handlers/workflowtrigger/cron_job.go#L20