Adding DRConfig swagger to SB2018-preview version#17

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mythri1006 wants to merge 4 commits intov-Ajnava:masterfrom

mythri1006:SBDRConfig_2018API

Commits on Sep 10, 2020

Commits on Sep 11, 2020

Updating the IsSafeFailover property in the ArmDisasterRecovery definition
mythri1006
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Commits on Sep 18, 2020

Updating the DisasterRecovery-Config swagger for ServiceBus 2018 API
mythri1006
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