app2app: Add new modality to parse ugs

I have modified algorithm to parse service create by user.
This algorithm is composed by 3 steps:
1) from connections, i create productions and save their
in productionsList (variable inside ServiceHandler)
2) i grouped productions in blocks. Every blocks is composed by
productions with same DX part.
3) i ordered blocks in base of dependencies.
For more details, see code.

Signed-off-by: Ventura Daniela <daniela1988@gmail.com>