Add euca-import-instance --key
Add euca-import-instance --key

Fixes TOOLS-467
Part of EUCA-9118

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