Remove the pid file if there is no process for the pid or the process name does not match.

[jjnicola]

What:
Remove the pid file if there is no process for the pid or the process name does not match.

Why:
To avoid removing the pidfile manually when ospd scanner was killed or stopped abruptly.

How:

• Start ospd-openvas. Try start it again. It should not be possible.
• Killall -9 ospd-openvas
• check that the pid file still exists but there is no process
• start ospd-openvas. The daemon should be started and the pid file should contain the pid of the running ospd-openvas.

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #405 (f5f4b3e) into ospd-20.08 (64d0b3c) will decrease coverage by 0.32%.
The diff coverage is 6.66%.

@@              Coverage Diff               @@
##           ospd-20.08     #405      +/-   ##
==============================================
- Coverage       74.55%   74.22%   -0.33%     
==============================================
  Files              23       23              
  Lines            2641     2654      +13     
==============================================
+ Hits             1969     1970       +1     
- Misses            672      684      +12     

Impacted Files	Coverage Δ
ospd/misc.py	44.15% <6.66%> (-7.41%)	⬇️

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[Kraemii]

Works as expected