Feature/add wal utilization check#178

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Matze-S wants to merge 7 commits intobucardo:masterfrom

Matze-S:feature/add-wal-utilitzation-check

Commits on Apr 9, 2021

added check_wal_amount() for monitoring log file utilization
Matthias Schmidt
committed

Commits on Apr 13, 2021

make critical and warning options optional, adjusted POD accordingly
Matthias Schmidt
committed
use wal file directory dependent on postgres version to allow using the --lsfunc option with postgres databases >= 9.6
Matthias Schmidt
committed
added test for wal size check
Matthias Schmidt
committed

Commits on Apr 14, 2021

added database cleanup before initialization to prevent written log data from previous tests
Matthias Schmidt
committed

Commits on Apr 15, 2021

wording in POD documentation improved and corrected
Matthias Schmidt
committed

Commits on Apr 19, 2021

fixed undefined warning of no critical and no warning option is given
Matthias Schmidt
committed