[bug] Using a variable in place of "stream" in Kapacitor v1.4 no longer works.

[ghost]

In Kapacitor v1.4, the below code doesn't work if you use a variable (e.g, task_type) instead of the word stream. When doing "define" tasks, it say Unknown task type.

var task_type = stream

var data = task_type
  |from()
....

It works fine in Kapacitor v1.3.3

[nathanielc]

Fixed in #1851