COLIBRI service must deliver two sets of tokens back to the requester in an EER setup

[juagargi]

At the moment the COLIBRI service returns the tokens to construct packets that are S=0,C=0. This works
It must return the tokens to build packets like these:

• S=0,C=0
• S=0,C=1
  These two types are all that the client end-host would need to use. Any packet with R=1 can be constructed by reversing the path.

The particular case for S=1,C=1 is already taken into account in the activation of SegRs, and needs not to be taken into account here in the EER scenario.

Note: While looking at this, also modify the EER to store those tokens, so that the traceroute case for EER will work by picking the correct set of tokens.