OOD deploy time config changes

Closes https://gitlab.rc.uab.edu/rc/hpc-factory/-/issues/214

This MR contains deploy time changes in the OOD config to

1. Accept connections only from OOD proxy
2. Point the shell app to the desired host
3. Fix for shell app timeout issue.

openstack-ood/nodeimage.pkr.hcl

@@ -60,7 +60,7 @@ build {
 
   provisioner "shell" {
     inline = [
-      "sudo yum install -y libselinux-python3 python3 python3-pip tmux vim git bash-completion curl wget unzip",
+      "sudo yum install -y libselinux-python3 python3 python3-pip tmux vim git bash-completion curl wget unzip NetworkManager",
       "sudo python3 -m pip install --upgrade pip",
       "sudo pip3 install s3cmd==2.3.0 ansible==4.10.0 python-openstackclient==5.8.0"
     ]