Commits on Dec 14, 2021

1. PVF validation host: do not alter niceness …

   We wanted to change niceness to accomodate the fact that some of the
   preparation tasks are low priority. For example, when a node sees that
   there is a new para was onboarded the node may start preparing right
   away. Since all other activities are more important, such as network I/O
   or validation of the backed candidates and preparation of the
   immediatelly needed PVFs.
   
   However, it turned out that this approach does not work: generally
   non-root processes can only decrease niceness and they cannot increase
   it to the previous value, as was assumed by the code.
   
   Apart from that, #4123
   assumes all PVFs are prepared in the same way. Specifically, that if a
   PVF preparation failed before, then PVF pre-checking will also report
   that it was failed, even though it could happen that preparation failed
   due to being low-priority. In order to avoid such cases, we decided to
   simplify the whole preparation model. Preparation under low priority
   does not work well with that.
   
   Closes #4520

   

   pepyakin committed Dec 14, 2021
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