Updated openstack/openstack
Project: openstack/oslo-incubator  aa7c658156e1e46315cdce1d580718f30054da2f

file_open: fixed docstring to refer to open() instead of file()

Now that we use open() instead of file(), we should refer to proper
function in the docstring.

Change-Id: I0d945784cbe24e34c8ef19d3d3c9c0f012cfe176