add "Accept: application/json" to headers on polling operations#11663

weidongxu-microsoft merged 2 commits intoAzure:masterAzure/azure-sdk-for-java:masterfrom

weidongxu-microsoft:mgmt_core_header_accept_jsonweidongxu-microsoft/azure-sdk-for-java:mgmt_core_header_accept_jsonCopy head branch name to clipboard