Finish #541 - return behavior to one-object per assignment, keep speed

[mtboren]

This update fixes the situation I described at #541 (comment). It does so by:

• iterating over the .securityTag subproperty which is a single property with a value that can be an array (previously it was thought that there were multiple values with a .securityTag property in the parent $oRestResponse.securityTags property -- this was incorrect)

And, this update also adds/updates the tests:

• now tests for not just presence of returned tag assignment objects, but that the count thereof corresponds to the known number of assignments (to try to prevent re-occurrence of this problem that I previously created and have now fixed)

Let me know how things look.

[dcoghlan]

jenkins test this please

[powernsxbot]

Tests Successful

[dcoghlan]

Thanks @mtboren for your contribution. Apologies its taken so long to get to this one.

[mtboren]

Woo-hoo! Np, @dcoghlan . Thanks for following through and finishing this up!