Rui Chen 4e71e9da6b Unit tests of quota command refactor
Do refactor for quota command related unit tests, remove
useless code, add new tests to cover '--volume-type' and
'--class' option in "quota set" command and add the
volume quota fake object.

Change-Id: Iaf214740e98db1bfb4c739e810bac1c5ba6e9625
2016-09-12 10:54:15 +08:00
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