B #7915: Fix PREDICTIVE config lookup in one_drs

read the lowercase "predictive" config key while the config stores
PREDICTIVE, so the predictive factor was always 0 and forecasts were
never blended in. Also guard against a None value coming from a cluster
ONE_DRS template without PREDICTIVE defined.

(cherry picked from commit 60dfce2026dec29904f01b5b88a7174c79dbbf53)

Author: atodorov-storpool

src/schedm_mad/remotes/one_drs/lib/optimizer_parser.py

@@ -972,7 +972,7 @@ def get_system_ds(self, host_id):
     def _apply_predictive_adjustment(
         self, current: float, forecast: float = None
     ) -> float:
-        predictive = self.config.get("predictive", 0)
+        predictive = self.config.get("PREDICTIVE", 0)
         if predictive > 0 and forecast > 0:
             return current * (1 - predictive) + forecast * predictive
         return current