version: bump - 0.4.31

[nikonov1101]

• Added: allow to specify pwd in secexec (feat: allow to specify pwd in secexec #1901).
  Also the usage of "secexec" has been slightly changed: now the executable and
  its arguments must be specified after "--".
  For example: secexec /etc/secexec -- /bin/ls -lith.
• Added: watch for keystore in sysinit.
• Fixed: more nvidia related .so files for volumes (fix: more nvidia related .so files for volumes #1907).
  Found out that we're skipping a lot of useful nvidia's .so files.
  This PR adds all of them to the docker volume.
  Based on the content of NVIDIA-Linux-x86_64-440.82.
  To keep the list up-to-date in the future:
  1. download the latest version on drivers;
  2. unpack them without installing: "./NVIDIA-Linux-x86_64-XXX.YY.run
     --extract-only";
  3. list .so and update the list in "insonmnia/worker/gpu/nvidia_tuner.go";
     Don't forget to remove versions and .0 from file names;
  4. ???
  5. Congratulation, you're awesome open-source contributor;
• Fixed: dwh tests (fix: dwh tests #1908).
  This PR fixes behavior with dwh test suite:
  • add required for run "POSTGRES_PASSWORD" environment
  • returns an error when Postgres not started any times, not null
  • format touched file imports
• Fixed: check for mount required before mounting.
• Fixed: weaken errors while constructing secsh banner.
• Fixed: allow to start QOS without secsh.
• Fixed: traverse children while looking for a device (fix: traverse children while looking for a device #1898).