test-dependencies.sh: Return non-zero return code when there was some failure detected
* this is useful when using from jenkins job where you don't want to read
output just to dectect how bad it was
* add .log suffix to all files, so they can be easily downloaded from
http servers without default mimetype set to something useful
* add recipes failed in step 1 to steps 2 and 3 to generate standalone
logs for them
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
