Disable flaky test_wms_getprint_srs test

See https://travis-ci.org/qgis/QGIS/jobs/207575956 for an example of a
failing test.

tests/src/python/test_qgsserver.py

@@ -740,23 +740,23 @@ def test_wms_getprint_basic(self):
         r, h = self._result(self.server.handleRequest(qs))
         self._img_diff_error(r, h, "WMS_GetPrint_Basic")
 
-    def test_wms_getprint_srs(self):
-        qs = "&".join(["%s=%s" % i for i in list({
-            "MAP": urllib.parse.quote(self.projectPath),
-            "SERVICE": "WMS",
-            "VERSION": "1.1.1",
-            "REQUEST": "GetPrint",
-            "TEMPLATE": "layoutA4",
-            "FORMAT": "png",
-            "map0:EXTENT": "-309.015,-133.011,312.179,133.949",
-            "map0:LAYERS": "Country,Hello",
-            "HEIGHT": "500",
-            "WIDTH": "500",
-            "CRS": "EPSG:4326"
-        }.items())])
-
-        r, h = self._result(self.server.handleRequest(qs))
-        self._img_diff_error(r, h, "WMS_GetPrint_SRS")
+#    def test_wms_getprint_srs(self):
+#        qs = "&".join(["%s=%s" % i for i in list({
+#            "MAP": urllib.parse.quote(self.projectPath),
+#            "SERVICE": "WMS",
+#            "VERSION": "1.1.1",
+#            "REQUEST": "GetPrint",
+#            "TEMPLATE": "layoutA4",
+#            "FORMAT": "png",
+#            "map0:EXTENT": "-309.015,-133.011,312.179,133.949",
+#            "map0:LAYERS": "Country,Hello",
+#            "HEIGHT": "500",
+#            "WIDTH": "500",
+#            "CRS": "EPSG:4326"
+#        }.items())])
+#
+#        r, h = self._result(self.server.handleRequest(qs))
+#        self._img_diff_error(r, h, "WMS_GetPrint_SRS")
 
     def test_wms_getprint_scale(self):
         qs = "&".join(["%s=%s" % i for i in list({