PEP8: Fix E261,E262

E261: Inline comment should have two spaces before
E262: Inline comment should start with '# '

There are some leftovers on the code. Maybe we should remove them?

Change-Id: Iac03a105ed4d00303f0df76c036f51d78a197a28
Explain why we can't fix E711,E712 for now

We use some storm queries like:
  obj.some_bool_col == True
Or:
  obj.any_col == None

Storm doesn't understand those queries if we use obj.col is True or something
like that. Until we find a way for solving working around this, we can't enable
those tests, unfortunately.

Change-Id: I3f105a2a9111672d2edf5440643a1634bfd1994f
Merge "PEP8: Fix E261,E262"
Merge "Explain why we can't fix E711,E712 for now"
runtime: Add set_default_store()

Change-Id: Icb3ea14283be5853b8c33ba4f4c9834c9951888f