Ability for facility service providers to add info to USER METADATA
Glideinwms factory passes useful info to the cloud VMS it launches through USER_METADATA. For example in case of EC2 based cloud providers, factory packages required info and adds ec2_user_data and ec2_user_data_file to the glidein's JDF. HTCondor generates the required metadata used passed the VM creation. However, this does not allow service providers/vo/factory operators to add anything else to the meta data. We need to find a way to coexist and share the metadata space more gracefully.