Allen Gao 0f01d3ebc7 Add the keyfile option to decrypt the passwords.yml
The passed keyfile path is used to decrypt the passwords.yml
which encrypted by the ansible vault.

Partially-Implements: blueprint	encrypt-sensitive-info
DocImpact
Change-Id: Ifaebf464478cde99e896c13b375cfaf9282ee576
2016-01-27 06:24:59 +08:00
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