Add missing backslash.

The one character commit of the day that needed two iterations.

Change-Id: I3bfe91c7e164d45d03348b18e0a457314b8baec7
Add option to skip downloading/uploading identical files

swift has already the upload option "--changed" to upload only changed
files. This patch adds a similar feature by comparing the md5 of the
local file to the remote object etag.

When used in combination with download the MD5 hexdigest of each file
is sent with an "If-None-Match" header to skip downloading identical files.

When used in combination with upload the MD5 is compared to the remote
etag by using the already existing HEAD request.

Change-Id: I727b0456558c6a7742b2428c6d1c45c4bfaf66e9
Only run flake8 on swiftclient code

In particular, this skips the "build" directory, which is prone to
containing stuff that doesn't comply with all the hacking checks. The
actual code we care about all lives in three places, so let's only
check those.

Change-Id: I4a3be59913ad85a5a9e91d254f4d3f4b0b1cc7b7
Merge "Add option to skip downloading/uploading identical files"
Merge "Only run flake8 on swiftclient code"
Merge "Add missing backslash."
Remove useless statement

Change-Id: Ide74b417ede6a4976c33fc835d366ed472033fd0
Merge "Remove useless statement"