Allow to add submit attributes also for grid and ec2 grid types
Currently submit attributes can be added using submit_attrs in the configuration,
but this works only for condor and BOSCO (batch) submission.
It would be useful to extend this also to regular grid submissions and ec2.
Farrukh tried to use it to change SYSTEM_PERIODIC_REMOVE in cloud submissions.
I do not see drawbacks in extending the publishing of the attributes.