[KeyVault] Enabling message protection protocol

[schaabs]

The changes in this pull request enable the message protection protocol, which is needed to perform key operations against vaults with message protection enabled.

The changes in this pull request have been previously reviewed here: #1686

[lmazuel]

@schaabs Please rebase your fork branch on top of keyvault_1.0_preview to avoid the swagger_to_sdk.config.json conflict

[jaredmoo]

Can you clarify why the SQL setup change is needed? Thx :)

[lmazuel]

@jaredmoo It's not, for some reason Github triggered a review from you, where you just owner of "azure-mgmt-sql". Too much git magic rebase :)

[lmazuel]

LGTM

[codecov-io]

Codecov Report

Merging #1828 into keyvault_1.0_preview will increase coverage by 0.06%.
The diff coverage is 68.62%.

@@                   Coverage Diff                    @@
##           keyvault_1.0_preview    #1828      +/-   ##
========================================================
+ Coverage                 52.81%   52.88%   +0.06%     
========================================================
  Files                      4579     4582       +3     
  Lines                    112596   113013     +417     
========================================================
+ Hits                      59469    59764     +295     
- Misses                    53127    53249     +122

Impacted Files	Coverage Δ
azure-keyvault/azure/keyvault/__init__.py	100% <100%> (ø)	⬆️
azure-keyvault/azure/keyvault/version.py	100% <100%> (ø)	⬆️
...ult/azure/keyvault/custom/http_message_security.py	21.51% <21.51%> (ø)
.../azure/keyvault/custom/key_vault_authentication.py	45.79% <48.97%> (+6.77%)	⬆️
...e-keyvault/azure/keyvault/custom/http_challenge.py	78.46% <78.46%> (ø)
azure-keyvault/azure/keyvault/custom/internal.py	84.55% <84.55%> (ø)

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