Default lockutils to using a tempdir

* Previously lockutils attempted to use __file__/../ as the lock path.
  This causes packages to fail if the user running the code doesn't have
  +w access to that dir. Remove the default so it will use mkdtemp
  instead
* Fixes bug 1107950

Change-Id: Ie0cd6fac5403a53a768eb4a0ce7da602b3fef755
Merge "Default lockutils to using a tempdir"