Don't strip whitespace in the -f option

Allow leading and trailing spaces in folder names specified on the
command line.

Reviewed-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Dan Christensen <jdc@uwo.ca>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

Changelog.draft.rst

@@ -16,6 +16,9 @@ New Features
 Changes
 -------
 
+- no whitespace is stripped from comma-separated arguments passed via
+  the -f option.
+
 Bug Fixes
 ---------
 

offlineimap/init.py

@@ -240,8 +240,7 @@ class OfflineImap:
 
         #custom folder list specified?
         if options.folders:
-            foldernames = map(lambda s: s.strip(),
-                              options.folders.split(","))
+            foldernames = options.folders.split(",")
             folderfilter = "lambda f: f in %s" % foldernames
             folderincludes = "[]"
             for accountname in accounts.getaccountlist(config):