Revert "[FLINK-13827][script] shell variable should be escaped"

[zentol]

This reverts commit 865cc4c.

The addition of quotes means that the log settings are passed as a single argument, rendering it ineffective.

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[tillrohrmann]

Thanks for creating this PR @zentol. The change itself looks good to me. Quick question: Are we now supporting paths which contain whitespaces which FLINK-13872 tried to solve?

[zentol]

Probably not. I'll try adding some escaped quotes to the individual log settings.

[tillrohrmann]

Sounds good @zentol.

[zentol]

@tillrohrmann Escaped quotes don't; but I found another solution using arrays in the BashFAQ.
This seems to work.
... I also found this in flink-daemon.sh; could've saved some time there...

There were also other cases where we did not properly handled spaces (FLINK-17809); I have included a fix for this in this PR.

[tillrohrmann]

Thanks for updating this PR @zentol. LGTM. +1 for merging.