Refactor: libpe_status: pe_node_attribute_calculated() accepts node type

Use enum pe__rsc_node in pe_node_attribute_calculated() to determine
which container host (assigned or current) to get the attribute value
from. For now, there's no use case for pending.

Pass pe__rsc_node_current for existing calls, since that maintains the
existing behavior.

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