[20180913211708] Rollback Errors and Bug Fixes

[ddollar]

Returns an error from --wait if the application rolls back during the update.

Fixes standard_init_linux.go:190: exec user process caused "no such file or directory" on Alpine-based containers.

• #2934 return an error from wait if rolled back [@ddollar]
• #2935 change binary build order [@ddollar]