Catching all child exit status values is a bad idea. Setting an http sstate mirror
is a great way to view that spectacularly break things. The previous change did
have good code changes so don't revert those parts.
(Bitbake rev: fa7ffb62d510ac1124ae7e08fa4d190a710f5b54)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>