Preceding the key value with '~' causes the key=value pair to be deleted
(only when --in-place is specified), as shown below:
$ cobbler system report | grep metadata
ks metadata : {}
$ cobbler system report --name=test | grep metadata
ks metadata : {}
$ cobbler system edit --name=test --in-place --ksmeta='a=b'
$ cobbler system report --name=test | grep metadata
ks metadata : {'a': 'b'}
$ cobbler system edit --name=test --in-place --ksmeta='~a'
$ cobbler system report --name=test | grep metadata
ks metadata : {}
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