Fix incorrect url and clarify subscription-level disable (unsure why this came with so many commits)

[asinn826]

This PR seems to contain all the changes that were approved and merged in this earlier PR: #3498

2 extra changes on top of those are commits ddf58c3 and 90ad551- both minor. Not sure why this is so big. @sergey-shandar , are you able to help me with this one?

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Automation for azure-sdk-for-python

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#3131

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[azuresdkci]

Can one of the admins verify this patch?

[lmazuel]

@sergey-shandar giving it to you, since it seems you have context.

[sergey-shandar]

@asinn826 why are we introducing breaking changes in the stable API?

[KrisBash]

Given the invalid URIs that existed in the prior version, I'm assuming this is a case where Swagger deviated from the implementation? If this is simply a case of fixing an invalid swagger spec, signing off from ARM.