[core] behavior change: stricter URL normalization

[core] behavior change: stricter URL normalization

behavior change: stricter URL normalization

Prior behavior can be obtained by configuring lighttpd.conf with:
      server.http-parseopts = (“url-normalize” => “disable” )
although this is not recommended.

This behavior change was pre-announced with the releases of
  lighttpd 1.4.52 (2018.11.28)
  lighttpd 1.4.53 (2019.01.27)

The recommended settings are:
      server.http-parseopts = (
        "header-strict"            => "enable",
        "host-strict"              => "enable",
        "host-normalize"           => "enable",
        "url-normalize"            => "enable",
        "url-normalize-unreserved" => "enable",
        "url-normalize-required"   => "enable",
        "url-ctrls-reject"         => "enable",
        "url-path-2f-decode"       => "enable",
        "url-path-backslash-trans" => "enable",
        "url-path-dotseg-remove"   => "enable",
        "url-query-20-plus"        => "enable"
      )

The lighttpd defaults with this commit are slightly less strict:
      server.http-parseopts = (
        "header-strict"            => "enable",
        "host-strict"              => "enable",
        "host-normalize"           => "enable",
        "url-normalize"            => "enable",
        "url-normalize-unreserved" => "enable",
       #"url-normalize-required"   => "enable",
        "url-ctrls-reject"         => "enable",
        "url-path-2f-decode"       => "enable",
       #"url-path-backslash-trans" => "enable",
        "url-path-dotseg-remove"   => "enable",
       #"url-query-20-plus"        => "enable"
      )