Fixup axis order, always include SRS in BBOX parameter and SRSNAME
parameter for WFS 1.1 client.

Based on patch
http://trac.osgeo.org/mapserver/attachment/ticket/4228/ms_wfs-1.1.0-v02.patch
from mapserver/mapserver#4228
Don't append a second bbox parameter for wfs client requests.
Merge pull request #4720 from faegi/wfs11ClientAxisOrder

Fixup axis order and srs in wfs client mode.