Fix "in" comparisons with one element tuples

A single value enclosed in parentheses is not a tuple (it needs a comma
after the element) therefore the comparisons like 'if foo in ("bar")'
are wrong.

Closes-Bug: #1248443
Change-Id: I29a2227c9d83efc17ecfacc86d507d75edd4eaca
Merge "Fix "in" comparisons with one element tuples"