Update glexecComputingElement.py

Status codes < 127 mean glexec worked but the script it ran produced an error. This change allows Application Failed with Errors results to show through, rather than be masked by false "glexec CE submission" errors.
If Operations object is created without arguments, assume VO of the
current user
in getReplicas() rebuild PFN if useCatalogPFN is False
Use Operations('DataManagement/UseCatalohPFN')
Merge pull request #1916 from Andrew-McNab-UK/rel-v6r10

[v6r10] Update glexecComputingElement.py
Merge pull request #1918 from atsareg/fix-v6r10

[v6r10] ReplicaManager rebuilding PFNs
v6r10p22 notes
Removed redundant getPfnForLfn() calls
FIX: use data member for the useCatalogPFN flag
FIX: use PFN in __removePhysicalReplica()
cosmetics
successful should be defined always in __removeReplicas
Merge pull request #1919 from atsareg/fix-v6r10

[v6r10] Removed redundant getPfnForLfn() calls
Merge pull request #1924 from phicharp/Fix-v6r10-RM-140424

Fix v6r10 rm 140424
Make use of the Registry helper to get the VOMS information
Conflicts resolved with rel-v6r10