Base64-encode user-data in ImportInstance
Base64-encode user-data in ImportInstance

Fixes TOOLS-488
Fixes GitHub issue #47

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