Fix access log field parsing #4113
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What does this PR do?
This PR fixes #3841 and adds a unit test to cover the specific case that was causing it.
Basically, when using a YAML file to pass arguments, they are passed with escaped backquotes if backquotes are present in the input YAML file.
For example:
Would be received by the flaeg parser as
"Username=drop Hostname=drop ClientUsername=drop ClientHost=drop". The parser then used to break it down into key value pairs and store it in a map. What happened was that for the last key (hereClientHostin this example, the value had a backquote at the end of it (drop"in this case), which didn't match with eitherdrop,keeporredact. It was then replaced by the default value.Removing the backquotes in the YAML file was a workaround for this, but it definitely isn't intuitive, so a fix was needed in the parser itself to handle that case.
No documentation change should be needed.
Motivation
Fixing #3841
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