Merge branch 'maszyman-refactor-logging' into 'master'

Maszyman refactor logging

See merge request lb-nightly-functions!1 (merged)

(cherry picked from commit 8c3b033e)

4d93df01 first attempt of refactored logging e6eb9b00 fix indent 97e09272 account for variable scope 452937e0 fix scope 8af40114 use nonlocal variable bf97661f better naming 262a2e41 use ping to check if elasticsearch cluster is alive 395f3bb0 fix tests 15b1f989 move sending to socker innermost c3645569 decide just once if TASK_LOGFILE is present, instead of at each line from singularity output 11569507 use 512 bytes buffering instead of flushing at each line 366b8a5e fixing conflicts a4bc05b8 fix typo 5d8659fa update deps de505c1c fixing tests 7471abbf fixing more tests 4f9d2920 Merge branch 'master' into 'maszyman-refactor-logging'