It is not common, but HTTP requests can fail due to connection issues. In order to mitigate such situations and also improve logging, this PR enhances the Redfish request handling by adding an execution flow for re-trying HTTP requests; the retry happens only if the global settings redfish.retries is set to 1 or more retries; default is of 2 (two). One can disable the retries by setting redfish.retries to 0 (zero).