[DNS] Add DNS 2017-09-01 Swagger for CAA Record Support

[AutorestCI]

Generated from RestAPI PR: Azure/azure-rest-api-specs#1835

[lmazuel]

LGTM but need new records

[codecov-io]

Codecov Report

Merging #1528 into master will decrease coverage by 4.27%.
The diff coverage is 86.95%.

@@            Coverage Diff             @@
##           master    #1528      +/-   ##
==========================================
- Coverage   54.23%   49.96%   -4.28%     
==========================================
  Files        3584     3661      +77     
  Lines       88213   108101   +19888     
==========================================
+ Hits        47846    54011    +6165     
- Misses      40367    54090   +13723

Impacted Files	Coverage Δ
azure-mgmt-dns/azure/mgmt/dns/models/resource.py	100% <ø> (ø)	⬆️
...zure/mgmt/dns/operations/record_sets_operations.py	90.78% <100%> (ø)	⬆️
azure-mgmt-dns/azure/mgmt/dns/models/record_set.py	100% <100%> (ø)	⬆️
azure-mgmt-dns/azure/mgmt/dns/models/__init__.py	100% <100%> (ø)	⬆️
...-dns/azure/mgmt/dns/operations/zones_operations.py	91.93% <100%> (-0.26%)	⬇️
azure-mgmt-dns/azure/mgmt/dns/models/zone.py	100% <100%> (ø)	⬆️
...e-mgmt-dns/azure/mgmt/dns/dns_management_client.py	100% <100%> (ø)	⬆️
...ure/mgmt/dns/models/dns_management_client_enums.py	100% <100%> (ø)	⬆️
azure-mgmt-dns/azure/mgmt/dns/version.py	100% <100%> (ø)	⬆️
azure-mgmt-dns/azure/mgmt/dns/models/caa_record.py	57.14% <57.14%> (ø)
... and 633 more

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