Switch tag subcollection missing

[ashkuren]

Tag subcollection is missing for switch class.
https://github.com/ManageIQ/manageiq-api/blob/master/app/controllers/api/switches_controller.rb
Tags can be read via /switches endpoint but not created or updated.

This issue is similar to #801.

[kbrock]

So it looks like it will just copy/paste #804 to Switches
This can probably be a Mixin for tags.

[miq-bot]

This issue has been automatically marked as stale because it has not been updated for at least 3 months.

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