Migration of the closeOutWorkflows script to dbs3

In general:
closeOutWorkflows: new script uses dbs3Client
dbs3Client: only uses dbs3
phedexClient: has the phedex functions formerly found on closeOutsScript and dbsTest.
reqMgrClient: has the reqMgr functions formerly found on  closeOutsScript and dbsTest.
dbs3client: has the dbs functions formerly found on  closeOutsScript and dbsTest.
WorkflowPercentage: for querying the workflow progress a la dbsTest.py using dbs3 only
duplicate