Improve NFV support

[EmilienM]

Adding a new parameter, dpdk_interface which allows to enable DPDK in dev-install.

It'll do the following:

• Pre-configure the Kernel before the configuration of DPDK (and reboot if necessary)
• Configure Tuned before installing OpenStack
• Configure TripleO roles & services, to enable basic parameters for OVN or OVS DPDK.
• Create a specific network_config when DPDK is enabled, and only use OVS for the DPDK network; and leave the other networks on their own interface instead of a bridge. The dummy interfaces will be configured via nmstate, with their proper IP config.
• Dynamically configure Neutron Bridge mapping for DPDK.
• Create flavors for DPDK, they're optional but can be useful.
• Manage the provider network dedicated to DPDK and deal with SNAT like we did for hostonly already.
• Set NovaComputeStartupDelay: to 180, so after a reboot it'll wait 2 min before starting nova-compute. It will give some time to Ceph to start and avoid errors in Nova.

Some changes for SR-IOV:

• Create a dedicated SR-IOV network when needed

When SR-IOV is enabled, we will create a dedicated provider network where the SR-IOV nic will be plugged into.

This will allow to separate the provider networks from regular interfaces, SR-IOV and later DPDK.

It won't do the following:

• Configure CPU partitioning for Nova, the host and DPDK However it provides an example of overrides that can be used to deploy with DPDK.

Note: we had to partially import Ansible roles from tripleo-ansible. The reason is that we have to deal with Kernel & tuned before installing OpenStack otherwise the deployment of OpenStack will fail at the OVS DPDK step, since the kernel wouldn't have been configured and the host rebooted. So we imported the roles, run it in prepare_host step so when TripleO is being run, the Kernel & Tuned are already configured.

[EmilienM]

under testing via https://github.com/shiftstack/ci-configs/pull/40

[EmilienM]

I managed to finish a deployment but I still have errors with DPDK: https://paste.opendev.org/show/809591/ I think I'm close. Reviews are welcome.

[EmilienM]

I talked to @christophefontaine and I need to change the os-net-config, to do the following when DPDK is enabled:

• Remove br-ex and keep external interface on the system outside of any bridge, to avoid IN/OUT from kernel & userspace, for public traffic (floating IP, etc)
• Do the same for other networks: hostonly, SR-IOV
• Only create a bridge for DPDK
• Update Neutron Bridge mapping in Heat params

[EmilienM]

When enabling DPDK, I'm having DHCP issues on non DPDK networks (SR-IOV, hostonly and tenant networks), I'll investigate that before we merge this one.