CLOUDSTACK-5544: Snapshot action filter: Remove check on volume state
CLOUDSTACK-5544: Snapshot action filter: Remove check on volume state

Removes conditional check of volume state for snapshot action filter,
since it causes a null pointer when trying to access view outside the storage
section. Now only '.revertable' attribute is checked. Storage state should now
be verified at the API level only.

jcshen007/cloudstack,resmo/cloudstack,resmo/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,wido/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,resmo/cloudstack,wido/cloudstack,resmo/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,resmo/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,jcshen007/cloudstack,wido/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,resmo/cloudstack,resmo/cloudstack,jcshen007/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack