If-else with same path in both directions

An analysis of the code with a static analysis tool (OpenScanHub)
revealed that there is an if-else block that had identical 'then'
and 'else' branches. It seems clear that the if-else block is no
longer needed, so this patch removes it.

Change-Id: I5152c5d58d0db263045cb95d47d594c518bbc8da

ceilometermiddleware/swift.py

@@ -317,10 +317,7 @@ class Swift(object):
         for header in env:
             if header.startswith('HTTP_') and env[header]:
                 key = header[5:]
-                if isinstance(env[header], str):
+                headers[key] = str(env[header])
-                    headers[key] = str(env[header])
-                else:
-                    headers[key] = str(env[header])
 
         try:
             container = obj = None