Document how to scale up/down deployments in openshift

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

scale_up_or_down_deployment.md

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+# How to scale up/down a deployment in openshift?
+
+* Log into os-master01 (prod or stg depending on what you want)
+
+* Retrieve the list of projects if you don't know how it's named
+```
+oc projects
+```
+
+Find there the one of interest
+
+* Get its deployments
+```
+oc -n <project name> get dc
+```
+
+This will return you the different deployments in the project.
+Find the name of interest
+
+* Scale the deployment up/down
+```
+oc -n <project name>  scale dc/<deployment name> --replicas=<number of pods desired>
+```
+
+If you do not want any running pods, simply use ``--replicas=0``
+