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).
This PR adds support for the OOBM Redfish protocol, implementing a Java client to send HTTP requests to Redfish supported systems.
Implementation overview:
- Redfish Java client: a Java Client for Redfish that makes Redfish actions available to the HA workflow via an OOB driver.
- OOB Redfish driver: a new Out-of-band driver was created for Redfish, allowing to integrate the Redfish Client with the CloudStack Out-of-band management implementation.
Fixes: #3624
