[AutoPR sdk/network/mgmt-v2019_09_01] Remove readonly attribute from customIpPrefix commissionedState property#3543

openapi-sdkautomation[bot] wants to merge 2 commits intosdkAutomation/sdk_network_mgmt-v2019_09_01AzureSDKAutomation/azure-sdk-for-java:sdkAutomation/sdk_network_mgmt-v2019_09_01from

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