openstack: Cherry-pick from upstream #641
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As well known and well documented, in virtual deployments of Kubernetes such as running on top of OpenStack where the underlying virtualization platform is KVM, it does not support a virtualized iommu, the VFIO PCI driver needs to be loaded with a special flag. This patch aims to do it by default in the virtual_plugin, since this plugin is only used by OpenStack for now. Note: it also changes `utils.LoadKernelModule` function to support kernel module arguments. It also adds a note in `load-kmod.sh` about the fact that a module won't be reloaded with potential new options if the module is already loaded on the system.
This commit includes a new dependency that provides a HTTP client interface with automatic retries and exponential backoff.
In most cases, OpenStack metadata service is available in the cloud, which removes the requirement of config-drive. This patch will change the logic to try reading Metadata and Network data from the config-drive directory but if it's not present, it'll try to get it by safely fetching the URL.
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This PR backports the following PRs:
k8snetworkplumbingwg/sriov-network-operator#257
k8snetworkplumbingwg/sriov-network-operator#258