Fix tag_suffix for accounting service

[alanwest]

The Helm chart generates a kubernetes manifest that expects the suffix of the account service's image to be accountingservice.

opentelemetry-demo/kubernetes/opentelemetry-demo.yaml

Lines 9533 to 9535 in fa7847e

	containers:
	- name: accountingservice
	image: 'ghcr.io/open-telemetry/demo:1.12.0-accountingservice'

Few options to fix this:

1. This PR
2. Fix the Helm chart to use the new name
3. Others?

I'd be happy to follow up on whatever solution people would prefer.

If people like the solution in this PR, I think it would also make sense to change the directory name and all contained files back to accountingservice for consistency - e.g., /src/accounting becomes /src/accountingservice. Thoughts?

I see now that there is an effort to remove the term service from the names of the services in #1788. I recommend leaving the tag_suffix for services untouched for now.

[puckpuck]

Closing this as the nightly releases are not part of anything we would deploy on Kubernetes or do with a fresh repo clone + make a start. The Kubernetes deployments that we support are fixed to the last good release, which is 1.12.0 right now. The nighlies will carry the new names for services as we change and we need to continue to do that for development reasons.