Clean up and review error messages

[jjcollinge]

There are multiple places where errors have context added at multiple layers that are obsolete. We should review the current logging and clean up any messages where this is the case. An example would be: mongodb.go func: NewMongoDB() - the underlying mgo will raise a detailed error to do with the connection, this function then adds the context "can't connect to mongo, go error..." then the callers of this function add additional context such as "failed initialising mongo connection", resulting in the error message:

failed initialising mongo connection: can't connect to mongo, go error: host unreachable which could be simplified to Kubernetes provider failed to initialise a connection to MongoDB: host unreachable

There are multiple occurrences such as this throughout the code base.