Change image read buffer size from 8k to 16k
Change image read buffer size from 8k to 16k

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