[models] Subnet.__str__ should return also subnet name #74

[NoumbissiValere]

This PR request solves issue #74

[coveralls]

Pull Request Test Coverage Report for Build 268

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 251:	0.0%
Covered Lines:	477
Relevant Lines:	477

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💛 - Coveralls

[NoumbissiValere]

Sorry about that @atb00ker i thought separating it makes it easier for review instead. i will join it into one commit. Thanks for the correction.