Simple locator tests

@mfalesni, it seemed useful to have test coverage on this, so I put together a test module for this trying to demonstrate your proposed use-cases. There are test errors, which I will detail inline.
```
utils/tests/test_simple_locators.py:46: in test_by_element_with_class
>       assert_len('h1.class1', 1)
utils/tests/test_simple_locators.py:13: in assert_len
>       assert len(pytest.sel.elements(locator)) == required_len
E       assert 0 == 1
E        +  where 0 = len([])
E        +    where [] = <function traced_fn at 0x18c9e578>('h1.class1')
E        +      where <function traced_fn at 0x18c9e578> = <module 'cfme.fixtures.pytest_selenium' from '/home/semyers/ve/cfme-qe/cfme_tests/cfme/fixtures/pytest_selenium.py'>.elements
E        +        where <module 'cfme.fixtures.pytest_selenium' from '/home/semyers/ve/cfme-qe/cfme_tests/cfme/fixtures/pytest_selenium.py'> = pytest.sel
```