doc: add missing information for network access

vagrant--devstack/README.md

@@ -1,12 +1,16 @@
 # Vagrant-Devstack
 
-## Usage
+## Setup the virtual machine
 
 On the host machine
 
     vagrant up --provider=libvirt
-
     vagrant ssh-config > ~/.ssh/config
+
+## Setup tunnels
+
+On the host machine
+
     ssh -L 8081:192.168.56.21:80 vagrant@control -N
 
 On your local machine
@@ -17,6 +21,21 @@ Then open your favorite web browser on the following address:
 
     http://localhost:8081/dashboard/
 
+## Setup proxy (for openstack CLI)
+
+On the host machine
+
+    ssh -L 3128 vagrant@control -N
+
+    export https_proxy=socks5://localhost:3128
+    export http_proxy=socks5://localhost:3128
+    export no_proxy=localhost,127.0.0.1
+
+The verify with the CLI:
+
+    openstack image list
+
+
 ## References
 
 * https://opendev.org/openstack/devstack-vagrant