http: strip 'proxy' part of http_uri

Strip the 'proxy' parts from the normalized uri as inspected by http_uri,
urilen, pcre /U and others.

  In a request line like:
    GET http://suricata-ids.org/blah/ HTTP/1.1
  the normalized URI will now be:
    /blah/

This doesn't affect http_raw_uri. So matching the hostname, etc is still
possible through this keyword.

Additionally, a new per HTTP 'personality' option was added to change
this behavior: "uri-include-all":

  uri-include-all: <true|false>
    Include all parts of the URI. By default the
    'scheme', username/password, hostname and port
    are excluded. Setting this option to true adds
    all of them to the normalized uri as inspected
    by http_uri, urilen, pcre with /U and the other
    keywords that inspect the normalized uri.
    Note that this does not affect http_raw_uri.

So adding uri-include-all:true to all personalities in the yaml will
restore the old default behavior.

Ticket 1008.