Refactor examples to build with MBEDTLS_CERTIFICATE_BUNDLE disabled. Only examples
that can work with certificate bundle disabled have been modified here.
- This allows to easily test example with different public servers
- Flash footprint impact is limited due to selection of only most common
certs from bundle.
Replaced hyphens with underscores in examples
project definition for all examples which had
hyphens in their project name. dpp-enrollee is
an exceptions because the name matches the
project directory name while the project
directory also contains hyphens.
