Fix split in Deploy/playbook/roles/common_files/swift_config.py

[ghost]

8. You need to be careful with SPLIT and PATH exist in python : - )
   There's the following code in Deploy/playbook/roles/common_files/swift_config.py
   def install(conf):
   object_server_conf_files = conf.get('object-confs', 'object_server_conf_files').split(',')
   for f in object_server_conf_files:
   if os.path.exists(f):
   patch_swift_config_file(conf, f, 'object')

Where the config file on disk, to handle the scenario where there are multiple object conf files, as an example:
object_server_conf_files = /etc/swift/object-server/1.conf, /etc/swift/object-server/2.conf, /etc/swift/object-server/3.conf, /etc/swift/object-server/4.conf

So this all looks harmless enough ... but much later down the line I realised my object files were not all patched, now there were two reasons for this (one I'll cover in another section) but the code bug is as follows.
Calling split in python as done above will return:
"file1"
" file2"
" file2"
...
Notice the whitespace, looks harmless but this causes os.path.exists to fail (ouch), and we skip the files !
The first is to first call:
f = f.strip()