Open Stack

Change
https://review.openstack.org/#/c/262804 renames - as suggested by trove 
folks - "data store" to "datastore".

Looking up the IBM terminology which we use as reference (
http://www-01.ibm.com/software/globalization/terminology/d.html ), I see 
"data store".

So, should we follow trove practice or not? Currently, we are not 
consistent, a grep reveals both usages in our guides,

Andreas
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  Andreas Jaeger aj@{suse.com,opensuse.org} Twitter: jaegerandi
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