WCS 2.0 RectifiedGrid: use 'lon lat' and 'x y' labels even with CRS with 'inverted axis' order

My understanding of the thread at https://lists.osgeo.org/pipermail/gdal-dev/2017-November/047650.html
is that the RectifiedGrid.axisLabels element should reflect the way the grid axis are ordered (and
not the axis order of the CRS as mandated by EPSG). As our offsetVector s are ordered in the GIS
friendly order, the labels should reflect that as well

Note that according to Peter Baumann per https://lists.osgeo.org/pipermail/gdal-dev/2017-November/047668.html
the content could be pretty much anything.

Author: rouault

mapwcs20.c

@@ -2038,17 +2038,9 @@ static void msWCSCommon20_CreateDomainSet(layerObj* layer, wcs20coverageMetadata
       }
 
       if(projection->proj != NULL && pj_is_latlong(projection->proj)) {
-        if (swapAxes == MS_FALSE) {
-          strlcpy(axisLabels, "long lat", sizeof(axisLabels));
-        } else {
-          strlcpy(axisLabels, "lat long", sizeof(axisLabels));
-        }
+        strlcpy(axisLabels, "long lat", sizeof(axisLabels));
       } else {
-        if (swapAxes == MS_FALSE) {
-          strlcpy(axisLabels, "x y", sizeof(axisLabels));
-        } else {
-          strlcpy(axisLabels, "y x", sizeof(axisLabels));
-        }
+        strlcpy(axisLabels, "x y", sizeof(axisLabels));
       }
 
       xmlNewChild(psGrid, psGmlNs, BAD_CAST "axisLabels", BAD_CAST axisLabels);

msautotest/wxs/expected/wcs_20_desc_bands.xml

@@ -16,7 +16,7 @@
             <gml:high>104 60</gml:high>
           </gml:GridEnvelope>
         </gml:limits>
-        <gml:axisLabels>lat long</gml:axisLabels>
+        <gml:axisLabels>long lat</gml:axisLabels>
         <gml:origin>
           <gml:Point gml:id="grid_origin_multi" srsName="http://www.opengis.net/def/crs/EPSG/0/4326">
             <gml:pos>49.874157 14.487132</gml:pos>
@@ -204,7 +204,7 @@
             <gml:high>104 60</gml:high>
           </gml:GridEnvelope>
         </gml:limits>
-        <gml:axisLabels>lat long</gml:axisLabels>
+        <gml:axisLabels>long lat</gml:axisLabels>
         <gml:origin>
           <gml:Point gml:id="grid_origin_multi_new" srsName="http://www.opengis.net/def/crs/EPSG/0/4326">
             <gml:pos>49.874157 14.487132</gml:pos>