(PUP-2909) rubocop - enable Lint/AndOr on lib/puppet/pops

Removes usage of `and` and `or` in favor of '||' and '&&'
but only under lib/puppet/pops

Unfortunately, this also means that their use as control flow operators
e.g x = mymethod() or raise 'mymethod failed'
    y = mymethod() and y.newmethod
is also disallowed.