Balazs Gibizer f6bcac4772 Validate shutdown value of --block-device
The shutdown value of the --block-device parameter was stated to
to be either 'remove' or 'preserve' but the code only coverted
everything to False that was not equal to 'remove'.

This patch adds strict validation that rejects values other than
'remove' or 'preserve'.

Closes-bug: #1558157
Change-Id: I89a6c4fe90ec4d8155f4a7b93006d1972654a223
2016-03-16 17:51:00 +01:00
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