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Add OpenAPI documentation spec

See merge request !83

The :type, :default and :pattern were not inside schema block

Add missing workdir parameter when calling OAR's API

See merge request !82

OAR's API use the workdir parameter to define where to put the
oarapi.subscript file.

When the `branch` parameter is passed to the versions_controller,
a 404 is returned because g5k-api doesn't find the specified branch.
This is because of a missing concatenation with `origin/`, indeed
g5k-api's reference-repository only holds remote git references.

The role of this method was to list users for a vlan, this is covered in
VlanUsersController.

Before, the returned JSON contained only "ok" when a node was added to
vlan or "unknown_node", and nothing if the node was already present in
vlan.
Now, it will add a status and message field, for each case (successfully
added, unknown and already present in vlan).

This allow to have the same hash as the one returned on
`/vlans/nodes/{node}` resource

Add a glue to wrap kavlan's API

See merge request !80

In Kavlan, global vlans from other sites are called 'kavlan-remote'. To
be more understandable we choose to rename it.

This allow to list vlans, fetch a specific one and manage the dhcp
server for a vlan

Rails already had the parsed payload to params