Prevent implicit string concatenation

[nfx]

Strings like 'foo ' 'bar' resolve to 'foo bar', but are very confusing to read:

'The use of default dbfs: references is deprecated: ' '/mnt/things/e/f/g',

[nfx]

apparently p = astroid.parse('x = "foo bar" " baz"') collapses into a single str const