Update vagrant to kernel version 5.15

Signed-off-by: sferna1 <santhosh.fernandes@gmail.com>

dev_environment/Vagrantfile

@@ -33,6 +33,16 @@ Vagrant.configure("2") do |config|
 
     l3af.vm.synced_folder cfg['host_l3afd_code_dir'], "/home/vagrant/code/l3afd"
 
+    l3af.vm.provision "shell", inline: <<-SHELL
+      wget https://raw.githubusercontent.com/pimlie/ubuntu-mainline-kernel.sh/master/ubuntu-mainline-kernel.sh
+      chmod +x ubuntu-mainline-kernel.sh
+      sudo mv ubuntu-mainline-kernel.sh /usr/local/bin/
+      sudo ubuntu-mainline-kernel.sh -i 5.15.0
+    SHELL
+
+    # restart after upgrade
+    l3af.vm.provision :reload
+
     # Add Grafana apt repo
     l3af.vm.provision "shell", inline: <<-SHELL
       sudo apt-get install -y apt-transport-https