Add log directory to .gitignore
Add log directory to .gitignore

The log directory gets created when running specs locally. Let's ignore
it.

Change-Id: Id0219ba852698fcf14833bb85c4246278e51624a

fuel-infra/puppet-ironic,openstack/puppet-ironic,openstack/puppet-ironic,openstack/puppet-ironic,fuel-infra/puppet-ironic,fuel-infra/puppet-ironic