Add Kepler prerequisites on Flintlock Vagrantfile

[nikimanoledaki]

Add the following to this Vagrantfile:

• Support for cgroup v2 - done by installing Ubuntu 22.04 which comes with cgroups v2 support.
• Provide the kernel headers https://www.tecmint.com/install-kernel-headers-in-ubuntu-and-debian/
• Kernel with eBPF support https://github.com/iovisor/bcc/blob/master/INSTALL.md#kernel-configuration

Example from Openshift:

---
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  name: 50-master-kernel-devel-cgroupv2
  labels:
    machineconfiguration.openshift.io/role: master
spec:
  kernelArguments:
    - systemd.unified_cgroup_hierarchy=1
    - cgroup_no_v1="all"
  extensions:
  - kernel-devel