Updated openstack/openstack
Project: openstack/nova  9c262026a5dcb0789677f1e02979b67e8e8dd524
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Add nova.conf.sample to gitignore

Now that we aren't storing this in tree and are recommending people
generate it locally add nova.conf.sample to .gitignore.

Change-Id: I0727c7552fead5a201116f9c2c6510fec3b92cd6