Beamline: checks beamline env for RHEL9. Backwards compatible with RHEL8

common/src/aaredaqlib/beamline.py

@@ -10,5 +10,8 @@ class MXBeamline(Enum):
 
 
 def mx_beamline() -> MXBeamline:
-    name = os.getenv("BEAMLINE_XNAME", "SIMULATED").strip().upper()
+    name = os.getenv("BEAMLINE_XNAME")
+    if name is None:
+        name = os.getenv("BEAMLINE", "SIMULATED")
+    name=name.strip().upper()
     return MXBeamline[name] if name in MXBeamline.__members__ else MXBeamline.SIMULATED