debug: replace most of the debug() calls
debug: replace most of the debug() calls

This replaces most of the dump() calls with calls to
dtls_dsrv_hexdump_log() to log the message to the appropriate log
channel. the ifndef is not needed any more because
dtls_dsrv_hexdump_log() is replaced with an empty function in case
NDEBUG is set.

Signed-off-by: Hauke Mehrtens <435ddd46dc66c007a1fa20144c823d37e0d23436@hauke-m.de>

thecodemaiden/tinydtls-fork,OlegHahm/tinydtls,nmacs/tinydtls,spark/tinydtls,thecodemaiden/tinydtls-fork,nmacs/tinydtls,thecodemaiden/tinydtls-fork,yunus/TinyDTLS-WebID,yunus/TinyDTLS-WebID,jvermillard/tinydtls,fvdnabee/tinydtls,OlegHahm/tinydtls,jvermillard/tinydtls,OlegHahm/tinydtls,fvdnabee/tinydtls,nmacs/tinydtls,yunus/TinyDTLS-WebID,jvermillard/tinydtls,nmacs/tinydtls,fvdnabee/tinydtls,spark/tinydtls,spark/tinydtls