Support a flag for preserving partitions in Volume Manager
Support a flag for preserving partitions in Volume Manager

Add an attribute 'keep_data' to list of attributes of a
partition to indicate that data on that partition must
be preserved during provisioning and deployment of the node.

Change-Id: I5a6660c59d230632499de89c2eb17ce718e7481e
Implements: blueprint partition-preservation

gitfred/fuel-extension-volume-manager,gitfred/fuel-extension-volume-manager