Move VM naming from FreiburgSiteAdapter to Integration adapters

[cheidecker]

To support different naming conventions for the VMs in the FreiburgSiteAdapter, the following function needs to be moved to the corresponding IntegrationAdapters:
def __getVMName(self, batchJobId)

[Fra-nk]

The name is usually determined by the site that boots the machine, not by the batch system.
Moving this to the integration adapter seems counter-intuitive.

Nevertheless you do have a valid point that duplicating the information from multiple adapters is a potential cause of errors.

[mschnepf]

Yes, the site adapter should know the hostname by booting.

The problem is that other batch systems like SLURM has a limited namespace of worker node. Only the batch system (integration adapter) know which hostnames can be used.