Joint 0.7.2 (do not use) and 0.7.3 release
Catch suddenly terminated instances
#491 Maria Telenczuk.
enable AWS dispatcher tests and catch no instance.id error
#494 Maria Telenczuk.
Show training error msg (#495)
#495 Maria Telenczuk.
set back timeout error as training error
#498 Maria Telenczuk.
