ac9ffd6 secret: Introduce virSecretObjSave{Config|Data}

Authored and Committed by John Ferlan 7 years ago
    secret: Introduce virSecretObjSave{Config|Data}
    
    Move and rename the secretRewriteFile, secretSaveDef, and secretSaveValue
    from secret_driver to virsecretobj
    
    Need to make some slight adjustments since the secretSave* functions
    called secretEnsureDirectory, but otherwise mostly just a move of code.
    
        
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