liyingjun 6b47d8284b Fix telegraf task
When enabling telegraf, task failed with "the field 'vars' has an invalid value,
which appears to include a variable that is undefined. The error was: 'dict
object' has no attribute 'telegraf_services'"

Change-Id: I6dd5c401bf9b673685ad1b4a20f85c55ce04abbc
Closes-bug: #1662807
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