rfe12963: merging of query part in DO-HTTP-REQUEST

Previously

  (net.aserve.client:do-http-request "http://localhost/xxx?q1=1"
                                     :query '(("q2" "2")))

requested http://localhost/xxx?q2=2. Make it so that QUERY is merged
into the query part of the uri instead of clobbering it and
http://localhost/xxx?q1=1&q2=2 is requested.

Bumped version. Updated defpatch forms for 8.2 and 9.0.

Change-Id: Ibf3320bca798f1133760376ee4be40faccb12e8f