Updating resources at runtime

With the recent factoring of resources management, we could endup with the following scenario:

• version x.y.z released
• the user start nsxtool and create a say D19 experiment
• if the D19 yaml file does not exists in the resources directory it will be then created
• version x.y.z+1 is released in which the developers has added/modifed some keys in the YAML D19 resource file
• the D19 yaml file now exists and is directly loaded in the state it was in version x.y.z --> problem

So we must check and update the resources in their latest state at runtime