Temporary fix commit for GeoServer travis unittests

[lucernae]

Related with #501

This commit attempts to copy over GeoServer lib from docker images to host directory, because regular GeoServer war files not able to run.

[codecov[bot]]

Codecov Report

Merging #503 into 2.8.x-qgis_server will increase coverage by 2.75%. The diff coverage is n/a.

@@                  Coverage Diff                  @@
##           2.8.x-qgis_server     #503      +/-   ##
=====================================================
+ Coverage               38.6%   41.36%   +2.75%     
=====================================================
  Files                    403      403              
  Lines                  28950    28950              
  Branches                3671     3671              
=====================================================
+ Hits                   11176    11974     +798     
+ Misses                 17025    16234     -791     
+ Partials                 749      742       -7

Impacted Files	Coverage Δ
geonode/security/utils.py	34.3% <0%> (ø)	:arrow_up:
geonode/layers/models.py	73.91% <0%> (+0.36%)	:arrow_up:
geonode/qgis_server/helpers.py	66.48% <0%> (+0.53%)	:arrow_up:
geonode/api/api.py	63.74% <0%> (+0.72%)	:arrow_up:
geonode/qgis_server/models.py	81.48% <0%> (+0.74%)	:arrow_up:
geonode/qgis_server/signals.py	83.95% <0%> (+0.82%)	:arrow_up:
geonode/api/resourcebase_api.py	43.95% <0%> (+0.87%)	:arrow_up:
geonode/geoserver/signals.py	15.48% <0%> (+0.88%)	:arrow_up:
geonode/layers/views.py	37.67% <0%> (+1.38%)	:arrow_up:
geonode/maps/utils.py	41.42% <0%> (+1.42%)	:arrow_up:
... and 32 more

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[lucernae]

Finally