Added CRUD CLI tests for products. This closes issue #182.

Added CRUD CLI tests for products. This closes issue #182.

```bash
$ nosetests -c robottelo.properties tests/cli/test_product.py
2014-03-26 16:32:27 - robottelo - INFO - Paramiko instance prepared (and would be reused): 0x1026b4150
@Test: Check that only valid names can be used ... ok
@Test: Check that only valid names can be used ... ok
@Test: Check that only valid names can be used ... ok
@Test: Check that only valid names can be used ... ok
@Test: Check that only valid names can be used ... ok
@Test: Check that only valid names can be used ... ok
@Test: Check that only valid labels can be used ... ok
@Test: Check that only valid labels can be used ... ok
@Test: Check that only valid labels can be used ... ok
@Test: Check if product can be created with random names ... ok
@Test: Check if product can be created with random names ... ok
@Test: Check if product can be created with random names ... ok
@Test: Check if product can be created with random names ... ok
@Test: Check if product can be created with random names ... ok
@Test: Check if product can be created with random names ... ok
@Test: Check if product can be created with random labels ... ok
@Test: Check if product can be created with random labels ... ok
@Test: Check if product can be created with random labels ... ok
@Test: Check if product can be created with random labels ... ok
@Test: Check if product can be created with random labels ... ok
@Test: Check if product can be created with random labels ... ok
@Test: Check if product can be created with random description ... ok
@Test: Check if product can be created with random description ... ok
@Test: Check if product can be created with random description ... ok
@Test: Check if product can be created with random description ... ok
@Test: Check if product can be created with random description ... ok
@Test: Check if product can be created with random description ... ok
@Test: Check if product can be created with gpg key ... ok
@Test: Check if product can be created with gpg key ... ok
@Test: Check if product can be created with gpg key ... ok
@Test: Check if product can be created with gpg key ... ok
@Test: Check if product can be created with gpg key ... ok
@Test: Check if product can be created with gpg key ... ok
@Test: Check if product can be created with sync plan ... SKIP: Test not implemented
@Test: Check if product can be created with sync plan ... SKIP: Test not implemented
@Test: Check if product can be created with sync plan ... SKIP: Test not implemented
@Test: Check if product can be created with sync plan ... SKIP: Test not implemented
@Test: Check if product can be created with sync plan ... SKIP: Test not implemented
@Test: Check if product can be created with sync plan ... SKIP: Test not implemented
@Test: Check if product can be deleted ... ok
@Test: Check if product can be deleted ... ok
@Test: Check if product can be deleted ... ok
@Test: Check if product can be deleted ... ok
@Test: Check if product can be deleted ... ok
@Test: Check if product can be deleted ... ok
@Test: Update the description of a product ... ok
@Test: Update the description of a product ... ok
@Test: Update the description of a product ... ok
@Test: Update the description of a product ... ok
@Test: Update the description of a product ... ok
@Test: Update the description of a product ... ok
@Test: Update the label of a product ... ok
@Test: Update the label of a product ... ok
@Test: Update the label of a product ... ok
@Test: Update the label of a product ... ok
@Test: Update the label of a product ... ok
@Test: Update the label of a product ... ok
@Test: Update product's gpg keys ... ok
@Test: Update product's gpg keys ... ok
@Test: Update product's gpg keys ... ok
@Test: Update product's gpg keys ... ok
@Test: Update product's gpg keys ... ok
@Test: Update product's gpg keys ... ok
@Test: Update product's sync plan ... SKIP: Test not implemented
@Test: Update product's sync plan ... SKIP: Test not implemented
@Test: Update product's sync plan ... SKIP: Test not implemented
@Test: Update product's sync plan ... SKIP: Test not implemented
@Test: Update product's sync plan ... SKIP: Test not implemented
@Test: Update product's sync plan ... SKIP: Test not implemented

----------------------------------------------------------------------
XML: foreman-results.xml
----------------------------------------------------------------------
Ran 69 tests in 881.441s

OK (SKIP=12)
```