Check if client is initialised

[bschroeter]

Integration with benchcab requires that the client be initialised. We need a utility function that determines if the credentials are set up and working in order to submit the job.

In benchcab, when the client is called via PBS it is probably not going to have access to the internet (i.e. on a compute node with no access to it) so there will have to be an assumption that if the credentials file exists for the user, then it can connect.

In any case, the called job is independent of the benchcab run and should provide sufficient exception handling/error messaging if there is an issue with the credentials. Also, it should be able to be rerun regardless.