Catch the disk space availability exception.

[pattivacek]

Otherwise the download failure will not be properly reported to the backend.

[codecov-io]

Codecov Report

Merging #1530 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1530   +/-   ##
=======================================
  Coverage   81.82%   81.82%           
=======================================
  Files         186      186           
  Lines       11403    11403           
=======================================
  Hits         9330     9330           
  Misses       2073     2073

Impacted Files	Coverage Δ
...tualizr/package_manager/packagemanagerinterface.cc	94.28% <100%> (ø)	⬆️
src/libaktualizr/storage/sql_utils.h	84.72% <0%> (-1.39%)	⬇️
src/libaktualizr/storage/sqlstorage_base.cc	77.02% <0%> (-1.36%)	⬇️
src/libaktualizr/storage/sqlstorage.cc	77.05% <0%> (ø)	⬆️
src/libaktualizr/primary/sotauptaneclient.cc	90.14% <0%> (+0.13%)	⬆️
src/aktualizr_info/main.cc	91.16% <0%> (+0.93%)	⬆️

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