Adding parameter enableMultipleWriteLocations in Cosmos DB

[shurd]

To support multi-master, we are adding the parameter enableMultipleWriteLocations to the DatabaseAccountCreateUpdateParameters property so that users can enable this feature when creating an account.

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[hovsepm]

@shurd please fix Model Validator errors:

>>>>> Files changed in this PR are as follows:
specification/cosmos-db/resource-manager/Microsoft.DocumentDB/stable/2015-04-08/cosmos-db.json
specification/cosmos-db/resource-manager/Microsoft.DocumentDB/stable/2015-04-08/examples/CosmosDBDatabaseAccountCreateMulti.json
>>>> Number of swaggers found in this PR: 1
>>>>> Files deleted in this PR are as follows:
[]
Validating "examples" and "x-ms-examples" in  specification/cosmos-db/resource-manager/Microsoft.DocumentDB/stable/2015-04-08/cosmos-db.json:
 error : 
operationId: DatabaseAccounts_OfflineRegion
scenario: CosmosDBDatabaseAccountOfflineRegion
source: request
responseCode: ALL
severity: 0
errorCode: REQUIRED_PARAMETER_EXAMPLE_NOT_FOUND
errorDetails:
  code: REQUIRED_PARAMETER_EXAMPLE_NOT_FOUND
  id: OAV105
  message: >-
    In operation "DatabaseAccounts_OfflineRegion", parameter
    regionParameterForOffline is required in the swagger spec but is not present
    in the provided example parameter values.
  innerErrors: !<tag:yaml.org,2002:js/undefined> ''
 error : 
operationId: DatabaseAccounts_OnlineRegion
scenario: CosmosDBDatabaseAccountOnlineRegion
source: request
responseCode: ALL
severity: 0
errorCode: REQUIRED_PARAMETER_EXAMPLE_NOT_FOUND
errorDetails:
  code: REQUIRED_PARAMETER_EXAMPLE_NOT_FOUND
  id: OAV105
  message: >-
    In operation "DatabaseAccounts_OnlineRegion", parameter
    regionParameterForOnline is required in the swagger spec but is not present
    in the provided example parameter values.
  innerErrors: !<tag:yaml.org,2002:js/undefined> ''