RedfishSensor: Configurable polling intervall Add ability to re-configure RedfishServer polling interval through EntityManager .json file Tested: on gbcm. Added "PollRateMS": 500 to RedfishServer entity and verified new polling interval takes place. Google-Bug-Id: 384995794 Fusion2: https://fusion2.corp.google.com/7af764ef-7966-3913-84d5-edebdca5f776 https://fusion2.corp.google.com/4dd13dd3-cfbc-38fc-b090-8acbe06a8bb2 https://fusion2.corp.google.com/cac6bf5f-75f3-3567-bf1f-e7b9d529fc47 https://fusion2.corp.google.com/0ccf9424-bbab-3d73-9b28-cf056b7f1674 Change-Id: I6c2b460dcb1d8bd191263b6a10e35b9c4b7416e2 Signed-off-by: Eyal Ron <eyalron@google.com>