Define lcb::io::ConnectionRequest
Define lcb::io::ConnectionRequest

This isn't used anywhere yet, but I didn't want to end up with massive
commits.

Change-Id: Ibffc3d24ceb1cf9352aecfdafb5cb0623587f37b
Reviewed-on: http://review.couchbase.org/77044
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

couchbase/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,mody/libcouchbase,mody/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase