Change order_pub_sub to orderpubsub

[yaron2]

Applying the pub/sub component to Kubernetes results in the following error:

The Component "order_pub_sub" is invalid: metadata.name: Invalid value: "order_pub_sub": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')

This PR fixes the component name to be compliant with RFC 1123 .