Handle missprojection for raster layer reupload

[lucernae]

• Improve unittests for Layer Metadata Upload (overwrite flag=False, like in the form)
• Refactor missprojection handling for QGIS Server Raster layer
• Change build server URL. Fix #501

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (2.8.x-qgis_server@1bd13b4). Click here to learn what that means. The diff coverage is 54.54%.

@@                 Coverage Diff                 @@
##             2.8.x-qgis_server    #502   +/-   ##
===================================================
  Coverage                     ?   38.6%           
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  Files                        ?     403           
  Lines                        ?   28950           
  Branches                     ?    3671           
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  Hits                         ?   11176           
  Misses                       ?   17027           
  Partials                     ?     747

Impacted Files	Coverage Δ
geonode/tests/integration.py	0% <ø> (ø)
geonode/qgis_server/tests/test_views.py	99.72% <100%> (ø)
geonode/qgis_server/models.py	80.74% <50%> (ø)
geonode/layers/utils.py	56.28% <50%> (ø)
geonode/qgis_server/signals.py	83.12% <52.94%> (ø)

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[lucernae]

There still seems to be some problem with GeoServer. Perhaps the settings? Will fix on another PR.

501 is still error.