rest: add GET,POST /image/restrict

Allow to restrict image to scope:

 POST /image/restrict
 { "image" : 49, "scopes" : [ 1,3 ] }

 response: 200 OK

This restricts image with ID 49 to scopes 1 and 3.

You can also fetch the current list of restrictions:

 GET /image/restrict
 { "image" : 49 }

 response: 200 OK

 { "image" : 49, "scopes" : [ 1,3 ] }

Existing limitations in this interface:

 - Only restriction of image to center is possible at this moment.
 - This is only used by ogCP to validate if this is possible, no existing code
   in the ogserver uses this to restrict POST image/restore.

This is a usability feature.

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