skip the quota enforcement test for swift

this test is racing because by the time the large object upload
happens the quota update might not yet have propogated in swift.
As it's unclear if this is a swift bug or tempest assuming too
much, skipping is best for now.

Change-Id: I0c0a5fc5a23125a9c51e220ae5a1218c6e9ca075
Related-Bug: #1310597
Merge "skip the quota enforcement test for swift"