EC2 describe availability zone now returns a valid state - EUCA-1635

EUCA-1635
Ephemeral storage for HVM instances now ext3 formatted - EUCA-9132

EUCA-9132
Merge remote-tracking branch 'origin/dev/sjones/EUCA-1635' into testing
Merge remote-tracking branch 'origin/dev/sjones/EUCA-9132' into testing