Fix loss of uppercase during reverse noderange

Reverse noderang was changing names to lower case,
fix to preserve case.

confluent_server/confluent/noderange.py

@@ -57,7 +57,7 @@ def humanify_nodename(nodename):
 
 def unnumber_nodename(nodename):
     # stub out numbers
-    chunked = ["{}" if text.isdigit() else text.lower()
+    chunked = ["{}" if text.isdigit() else text
             for text in re.split(numregex, nodename)]
     return chunked