Add cumulus platform support

[predominant]

Signed-off-by: Graham Weldon graham@grahamweldon.com

Description

Allows omnibus to parse version information from Cumulus Linux.

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Maintainers

Please ensure that you check for:

• [] If this change impacts git cache validity, it bumps the git cache
  serial number
• [] If this change impacts compatibility with omnibus-software, the
  corresponding change is reviewed and there is a release plan
• [] If this change impacts compatibility with the omnibus cookbook, the
  corresponding change is reviewed and there is a release plan

[tas50]

Thanks @predominant

[predominant]

Fastest merge ever!