Updated openstack/openstack
Project: openstack-dev/devstack  ad2966d727df21653920d95dbf40711c2b8f2873
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Add hacking rules for shell scripts

This is an attempt to collect the rules that we live by in devstack
that are generally held. Writing these down help us figure out ways
to put them into bash8 over time. These are a starting point for
conversation.

Change-Id: Id2b750665871ebbeddf4694ba080c75d2f6f443e