Changed model in TAG_CLASSES array to VmOrTemplate instead of Vm

 "VM and Instance.My Company Tags: XXX" fields for Performance VM reports were not getting displayed in UI due to the model being incorrect in TAG_CLASSES array.

https://bugzilla.redhat.com/show_bug.cgi?id=1129228
Fixed spec broken spec test.

 Converted TAG_CLASSES array to word array.

https://bugzilla.redhat.com/show_bug.cgi?id=1129228
(cherry picked from commit 7a1319c)
Merge pull request #691 from h-kataria/fix_vm_tags_on_performance_vms_reports

Changed model in TAG_CLASSES array to VmOrTemplate instead of Vm