Refactor: tools: Clarify is_scheduler_required() in crm_resource.c

• There is no scheduler IPC connection. Rather, there may be a scheduler data object populated from the CIB connection. Correct the comments.
• The set of commands that require scheduler data is a subset of the set of commands that require a CIB connection. Make this explicit.

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>