create a way for automations to output notification GCFs

[tomscript]

we need a way that an automation can pass its output to another automation. for example, after we create a disk snapshot can we output the name of the disk we created to Turbinia? Or Slack?

we should create a PoC that standardizes what each automation outputs and a configuration where a user can specify an array of outputs.

[daniel-cit]

Suggestion of output message

OutputMessage struct {
 correlationID  string
 timestamp      string
 automationName string
 sourceInfo     string
 priority       string
 status         string
 sensitiveInfo  bool
 subject        string
 message        string
}

[daniel-cit]

Possible output destinations:

• Turbinia
• PagerDuty
• Slack
• Sendgrid
• Hangouts
• StackDriver

[daniel-cit]

initial version will implement integration with

• Turbinia
• PagerDuty

One CF for routing output messages, one CF for PagerDuty and One CF for Turbinia