Reduced configuration continued (#1)

* Simplify trace usage

* Cleanup: remove unnessary carriage returns from printfs

* Remove update authorize

This is default behaviour for Update client.

* Print IP

* Handle fcc_init errors

* Cleanup tracing

* Fix default certificate template

* Cleanup default configurations

SST is enabled by default.
Keep CEC client disabled also for K66F. No need to have advanced
features on this example.

* Cleanup printing

* Use same resources as MCCE

* Remove mbed_lib.json

* Remove developer-mode flag

* Implement reset+reboot on key-press 'r'

* Remove configs folder with all content

* Remove the need for PAL config file (requires patch)

* Fix printing of counter

* Remove button + led configs

* Remove old tests

* Add Device Management E2E tests

* Allow reading API key from MBED_CLOUD_SDK_API_KEY variable

* Add entropy injection with hardcoded entropy

* All platforms will use hardcoded entropy injection. This is needed
only for non-TRNG boards, but for code simplicity, do it for all.
* Accept also CA_CERT existing error from fcc_developer() API.

* Fix F411RE configuration

* Cleanup mbed_cloud_client_user_config file

Make Blocksize to be 512 KiB and update buffer 1 KiB by default.

This saves some RAM and 512 is going to be the client default
in future.

* Make INFO the default max for trace

* Remove esp-config as its not needed

* Add deregister (5000/0/1) and refactor shutdown handling

* Seperate functions for deregister callback and deregister handling.
* Refactored the logic for handling shutdown.
* Bring down network as part of shutdown.

* Update to MCC 3.3.0 and Mbed OS 5.13.0

Author: teetak01