Fix indentation in the minion config template

The example for the 'backup' param in the minion config file template is
indented one level further than it should. This commit fixes that.
Merge pull request #6342 from terminalmage/quickfix

Fix indentation in the minion config template
Document how the pillar namespace is flattened.
Alaways show triggered deprecation warnings on the unit test.
Test the deprecated `runas` argument to `salt.modules.pip`.
Trivial doc spelling fix

It is trivial but it is my first commit / pull request so useful for
checking the process is correct. And it has a semicolon
`user` and `runas` now raise an exception. "There can be only one".

* Always show the deprecation message `runas` is not `None`.
* If both `user` and `runas` are used, that's an error! Full Stop!
* If `runas` is being used and `user` is not, adapt the code and don't fail.
Merge pull request #6343 from go8ose/note-pillar-flat

Document how the pillar namespace is flattened.
Merge pull request #6344 from mikadosoftware/minor-doc-fix

Trivial doc spelling fix
Also deprecate `runas` on `salt.states.pip`.

* Added mock tests to check if the deprecation is triggered, and to see if the deprecation is also returned to the user in a warnings key.
Added test case to see if the usage of `user` and `runas` at the same time raises an exception.
Simplify `__virtual__` logic.
Merge pull request #6345 from s0undt3ch/hotfix/pip-tests

PIP module and state test cases, and minor improvments
Mocked test for `salt.modules.alternatives.display()`
Mocked test for `salt.modules.alternatives.show_current()`
Mocked test for `salt.modules.alternatives.check_installed()`
Mocked test for `salt.modules.alternatives.install()`
Mocked test for `salt.modules.alternatives.remove()`
Remove un-neded import.
Merge pull request #6347 from s0undt3ch/sprint/mock-salt.modules.alternatives

Mocked tests for `salt.modules.alternatives`