Add isccfg manual running mode

[pemensik]

For simplified manual testing add waking mode to parser script. Allows direct test run displaying just chosen statements or blocks.

Related: #1124

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[pemensik]

Is there a correct way to use print() in rhel7, without getting it reported by lint on el7?

[fernflower]

/packit test --labels sanity

[fernflower]

/packit test --labels sanity

[fernflower]

lgtm. Out of curiosity, do you have another pr that uses this script?

[pemensik]

No, those changes were made for my manual testing only.