Global WorkQueue using the wrong 'grouping' for pileup data location
**Impact of the bug**
Global WorkQueue

**Describe the bug**
While testing workflows in my VM, I noticed that global workqueue was creating elements which had an empty list of RSEs for the pileup data, even though the container rule had recently being satisfied.
Upon global workqueue restart, the LocationUpdateTask cherrypy thread gets executed and those elements get updated with the correct pileup location.

Both threads use the same method `getDataLockedAndAvailable`, but they provide a different set of arguments. For the workqueue, here is where the pileup gets resolved:
https://github.com/dmwm/WMCore/blob/master/src/python/WMCore/WorkQueue/Policy/Start/StartPolicyInterface.py#L255

while the LocationUpdateTask thread calls this:
https://github.com/dmwm/WMCore/blob/master/src/python/WMCore/WorkQueue/DataLocationMapper.py#L99

**How to reproduce it**
inject any workflow that requires pileup data.

**Expected behavior**
Pileup data location has to work during the workqueue element creation. Which means, the `grouping="DATASET"` key/value pair has to be removed (this internally uses the containe ruler RSEs for rules in the OK state).

**Additional context and error message**
There are no error messages, just the wrong information in the GQ element.
diff --git a/src/python/WMCore/WorkQueue/Policy/Start/StartPolicyInterface.py b/src/python/WMCore/WorkQueue/Policy/Start/StartPolicyInterface.py
index ea40075f1..4b6b89a1a 100644
--- a/src/python/WMCore/WorkQueue/Policy/Start/StartPolicyInterface.py
+++ b/src/python/WMCore/WorkQueue/Policy/Start/StartPolicyInterface.py
@@ -252,7 +252,7 @@ class StartPolicyInterface(PolicyInterface):
         for dbsUrl in datasets:
             for datasetPath in datasets[dbsUrl]:
                 if hasattr(self, "rucio"):
-                    locations = self.rucio.getDataLockedAndAvailable(name=datasetPath, grouping="DATASET",
+                    locations = self.rucio.getDataLockedAndAvailable(name=datasetPath,
                                                                      account=self.args['rucioAcct'])
                 else:
                     locations = set()
['src/python/WMCore/WorkQueue/Policy/Start/StartPolicyInterface.py']