Sync oslo lockutils to nova

The commit to be merged:

5c11c4d0 Don't import fcntl on Windows
de4adbc4 pep8: fixed multiple violations
9e88af17 fixed typos found by RETF rules

Related-bug: #1335897

Change-Id: Iec4cbb5fa7265b181a851f6ebfac9cd7c5685ed7
Merge "Sync oslo lockutils to nova"