Jeremy Stanley 1023e20f41 Determine CentOS 6 platform in cache-devstack
The centos element (which is CentOS 6.x specific) doesn't provide
DIB_RELEASE so we have to identify it another way.

Change-Id: Ibf3b25b99f03c6077538dec6c3770dc0f690e3f5
2015-05-01 20:57:05 +00:00
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