Fix a typo in describe-image-attribute
Fix a typo in describe-image-attribute

Fixes TOOLS-68

vasiliykochergin/euca2ools,jhajek/euca2ools,nagyistoce/euca2ools,nagyistoce/euca2ools,gholms/euca2ools,vasiliykochergin/euca2ools,jhajek/euca2ools,gholms/euca2ools