This patch modifies the code of some of the provided samples to be able to run
them in our platforms. By default, these applications cannot find the
certificates in the device, and the command line options are not working.
Patched samples:
* shadow_sample
* shadow_sample_console_echo
* subscribe_publish_sample
See https://github.com/aws/aws-iot-device-sdk-embedded-C.
https://jira.digi.com/browse/DEL-4101
Signed-off-by: Tatiana Leon <tatiana.leon@digi.com>