skip cli.test_org.TestOrg.test_positive_create_3

bz1142821
Merge pull request #1392 from alda519/cli-fix-org

fix one more cli test
Remove generate_string helper

The removal is in favor of FauxFactory.generate_string.

Bonus: some formating love
Merge pull request #1401 from elyezer/remove-generate-string

Remove generate_string helper
Improve CLI Org test_positive_create_3

Add an assertion to ensure the label is really the same as the hammer
argument.
Merge pull request #1402 from elyezer/cli-org-test-positive-create-3

Improve CLI Org test_positive_create_3
Add API tests for subnets

Make it possible to create, read and delete subnets using the `Subnet` class in
module `robottelo.entities`. Do this by adding several mixins to that class.
Verify that it is possible to create, read, update and delete subnets by adding
them to module `test_multiple_paths`.

Remove module `test_subnet`. It contains nothing but test stubs.