add qml and xml files when downloading a layer in zip and geotiff formats

[boney-bun]

fix #539

[boney-bun]

the PR in actions:
when downloading zip file:

when downloading geotiff:

[codecov]

Codecov Report

Merging #540 into 2.8.x-qgis_server will increase coverage by 0.03%.
The diff coverage is 90.9%.

@@                  Coverage Diff                  @@
##           2.8.x-qgis_server     #540      +/-   ##
=====================================================
+ Coverage              41.52%   41.55%   +0.03%     
=====================================================
  Files                    412      412              
  Lines                  29670    29688      +18     
  Branches                3752     3754       +2     
=====================================================
+ Hits                   12319    12336      +17     
  Misses                 16589    16589              
- Partials                 762      763       +1

Impacted Files	Coverage Δ
geonode/qgis_server/tests/test_views.py	99.28% <100%> (ø)	⬆️
geonode/qgis_server/views.py	61.67% <90%> (+1.25%)	⬆️
geonode/qgis_server/models.py	84.14% <0%> (+0.6%)	⬆️

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[codecov]

Codecov Report

Merging #540 into 2.8.x-qgis_server will decrease coverage by 7.97%.
The diff coverage is 0%.

@@                  Coverage Diff                  @@
##           2.8.x-qgis_server     #540      +/-   ##
=====================================================
- Coverage              41.52%   33.54%   -7.98%     
=====================================================
  Files                    412      412              
  Lines                  29670    29687      +17     
  Branches                3752     3753       +1     
=====================================================
- Hits                   12319     9958    -2361     
- Misses                 16589    19100    +2511     
+ Partials                 762      629     -133

Impacted Files	Coverage Δ
geonode/qgis_server/views.py	0% <0%> (-60.42%)	⬇️
geonode/qgis_server/context_processors.py	0% <0%> (-100%)	⬇️
geonode/qgis_server/urls.py	0% <0%> (-100%)	⬇️
...ent/commands/delete_orphaned_qgis_server_layers.py	0% <0%> (-100%)	⬇️
geonode/qgis_server/tests/test_qgis_settings.py	0% <0%> (-100%)	⬇️
geonode/qgis_server/tests/test_xml_utilities.py	0% <0%> (-100%)	⬇️
.../qgis_server/migrations/0003_auto_20170727_0509.py	0% <0%> (-100%)	⬇️
.../qgis_server/migrations/0005_auto_20170823_0341.py	0% <0%> (-100%)	⬇️
geonode/qgis_server/migrations/0001_initial.py	0% <0%> (-100%)	⬇️
geonode/qgis_server/admin/__init__.py	0% <0%> (-100%)	⬇️
... and 48 more

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[myarjunar]

1 line is enough IMO 😅

[myarjunar]

LGTM 👍

[boney-bun]

thanks @myarjunar
i'm going to merge this PR to see it on the testing