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Call this when you only need to detect Control Panel type, and don't need its complete properties.
The function avoids creating an instance of CP successor class.
This is safer for calling from installation scriptlets, when the system state can be inconsistent -
because instance initialization tries to collect much more info than _get_cp_class().
For example, 'apachectl' utility, used to gather server attributes into 'apache' instance variable,
can fail half-way 'mod_lsapi' post-installation. Specifically:
when the upgrade brings a non-backward compatible change of 'mod_lsapi.so'<->'liblscapi.so' binary interface,
at the moment when we have 'liblscapi.so' already updated,
but the new 'mod_lsapi.so' not yet copied into the Apache modules directory,
'apachectl' would fail due to unloadable modules, print errors instead of Apache properties,
and eventually produce installation failure.
See CLOS-3184.
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Call this when you want full Control Panel properties, not only its type.
Properties can fail to be obtained, or be invalid, in intermediate machine state, like half-installed 'mod_lsapi'.
See CLOS-3184.
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