Created VLANSuggestor to manage suggestion of VLANs.
Refactor SPTemplate to use VLAnSuggestor.
Created UnitSuggestor and make MP template use it to suggest units for interfaces.
Merge branch 'develop' into feature/mp-suggestor
Solve error loading vcpe bundle.

VCPE bundle was trying to use apache.commons.lang.math package of version [2.5, 3),
which was not installed in opennaas distribution. Thus failing.

This patch avoids the use of apache.commons.lang.math.
Valid vlans are now generated "manually", avoiding commonslang.math dependency.
Refactor SPTemplateSuggestor to use UnitSuggestor.
Merge pull request #528 from isartcanyameres/feature/mp-suggestor

Feature/mp suggestor