* Updated `salt.modules.file.makedirs` to properly work. Any path passed to this function should be a directory, ie, if `/tmp/foo/bar` is passed, `/tmp/foo/bar` should be a directory, not `/tmp/foo`.
* Since `salt.modules.file.makedirs` was updated, `salt.states.file.append` needed to be updated to pass the proper directory to create.
* Minor formatting change
* Expose what's happening in `integration.states.user.UserTest.test_user_if_present_with_gid()`.
* Update code that was using the old `SaltReturnAssertsMixIn`.
* In `salt.modules.pip.install()` we first check if file is already cached(in case being called from `salt.states.virtualenv.managed()`), if it's not, then try to cache it.
* If requirements and `runas` is passed, since `salt.fileclient`'s cache needs to be private, we create a temporary file with the contents of the requirements file, owned by the `runas` user, which then gets passed to the pip command.
* Always delete the user, even if test(`integration.states.virtualenv.VirtualenvTest.test_issue_1959_virtualenv_runas`) fails.
* Minor PEP-8.
* Created a mix which tests for the required assertion(True/False) and in case of a failure, shows salt comment kwarg in the raised assertion error so we know what was the original(salt's) failure.
