Introduce environment variable KALAMAR_CLIENT_FILE in auth plugin

Change-Id: I00c7058242036c56c34a77a319653d8cf6ad8d1f
diff --git a/Changes b/Changes
index fafbeaa..d8418a1 100755
--- a/Changes
+++ b/Changes
@@ -3,6 +3,8 @@
           assistant. (diewald)
         - Remove deprecated 'auth_support' (since 0.31)
           configuration parameter - use 'Auth' plugin instead. (diewald)
+        - Support environment variable KALAMAR_CLIENT_FILE for
+          client information.
 
 0.47 2022-11-22
         - Add command to generate super_client_info file. (diewald)