Add integrations/pagerduty API Support

[rlhh]

Datadog has recently introduced APIs to support CRUD operations for integrations(https://docs.datadoghq.com/api/?lang=bash#integrations).

This PR adds support for CRUD operations on the Pagerduty Integration https://docs.datadoghq.com/api/?lang=bash#pagerduty.

Things to note:

1. The request and response body does not match 1:1. For the request, the "service" object has "service_name" and "service_key" but for the response, we get "service" and "key".
2. The integration tests only compare the service names because

• The service key is returned as ****
• The schedules are verified so we cannot put in fake data during creation
• The API key is returned as ****

[ojongerius]

Could you please update the year to 2018?

[ojongerius]

Could you please add comments? See https://blog.golang.org/godoc-documenting-go-code

[ojongerius]

"removes"

[ojongerius]

Thanks for this!

the request and response body does not match 1:1. For the request, the "service" object has "service_name" and "service_key" but for the response, we get "service" and "key".

Would you be willing to raise an issue at Datadog, possibly linking this PR in, that looks like a bug to me.

[rlhh]

Thanks for the review!

I'm not sure what's the best place to raise this issue so I've raised it at datadog/documentation. It should at minimum be documented on Datadog itself.

[rlhh]

@ojongerius @yfronto What would be the next steps for this PR?

[ojongerius]

Thanks @rlhh! 🙇