Fix the handling of ambiguous delimiters in the query part of a URL

Fix the handling of ambiguous delimiters in the query part of a URL

This is the same fix as the previous commit did for the other
components of the URL. But we're also changing how we handle the "[]"
characters in a query: previously the handling was like for other
sub-delims; now, they're always decoded, assuming that the RFC had a
mistake and they were meant to be decoded.

Change-Id: If4b1c3df8f341cb114f2cc4860de22f8bf0be743
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>