expose panda job submissions similar to how we support BOSCO

As part of PM-1539 we came up with a representation for supporting panda batch gahp. on further discussions, it is best for users to configure this as a style panda that derives from the glite style. and the panda end point is specified as a grid gateway .

- name: titan
  directories:
  - type: sharedScratch
    path: /global/cscratch1/scratch
    fileServers:
    - url: file:///global/cscratch1/scratch
      operation: all
  - type: sharedStorage
    path: /global/cscratch1/pegasus/storage
    fileServers:
    - url: file:///global/cscratch1/pegasus/storage
      operation: all
  grids:
  - type: batch
    contact: http://pandawms.org
    scheduler: slurm
    jobtype: compute
  profiles:
    pegasus:
      style: panda


The planner should take this information and then generate the following grid_resource combination in the condor submit files
grid_resource = batch panda http://pandawms.org