Currently, the tools loosely follow the following convention on
error-codes:
* return 1 if the error is with any of the command-line arguments
* return 2 on other errors
This patch changes the returned error-code on unknown operation/command
to 100 (instead of the previous 1). The intent is to allow any wrapper
script to determine that the tool failed because the operation is
unrecognized and not because of something else. In particular this
should enable us to write a wrapper script for scylla-nodetool, which
dispatches commands still un-implemented in scylla-nodetool, to the java
nodetool.
Note that the tool will still print an error message on an unknown
operation. So such wrapper script would have to make sure to not let
this bleed-through when it decides to forward the operation.
Closesscylladb/scylladb#15517
caeddb9c88