Updated Description field of the ospd-openvas.service file.

[cfi-gb]

We should have a reference to GVM in the description so i took the description from here:

ospd-openvas/docs/ospd-openvas.8

Line 3 in b1ad2d8

ospd-openvas \- The OpenVAS Wrapper of the Greenbone Vulnerability Management

Better suggestions (also for the ospd-openvas.8) welcome.

[codecov]

Codecov Report

Merging #372 (4ee24fd) into ospd-openvas-20.08 (a0675db) will decrease coverage by 0.86%.
The diff coverage is 59.78%.

@@                  Coverage Diff                   @@
##           ospd-openvas-20.08     #372      +/-   ##
======================================================
- Coverage               82.71%   81.84%   -0.87%     
======================================================
  Files                       9        9              
  Lines                    1481     1526      +45     
======================================================
+ Hits                     1225     1249      +24     
- Misses                    256      277      +21     

Impacted Files	Coverage Δ
ospd_openvas/errors.py	100.00% <ø> (ø)
ospd_openvas/vthelper.py	86.61% <0.00%> (-2.10%)	⬇️
ospd_openvas/daemon.py	62.24% <44.44%> (-0.66%)	⬇️
ospd_openvas/db.py	96.24% <57.14%> (-3.36%)	⬇️
ospd_openvas/preferencehandler.py	87.93% <86.95%> (+0.82%)	⬆️
ospd_openvas/__version__.py	100.00% <100.00%> (ø)
ospd_openvas/lock.py	85.96% <100.00%> (+0.25%)	⬆️
ospd_openvas/nvticache.py	98.49% <100.00%> (+0.01%)	⬆️
ospd_openvas/openvas.py	100.00% <100.00%> (ø)

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