net/sock/dtls : Model 'DTLS_HANDSHAKE_BUFSIZE' with exponent
net/sock/dtls : Model 'DTLS_HANDSHAKE_BUFSIZE' with exponent

Introduced CONFIG_DTLS_HANDSHAKE_BUFSIZE_EXP to hold exponent and
update documentation

kYc0o/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,authmillenon/RIOT,miri64/RIOT,miri64/RIOT,jasonatran/RIOT,OTAkeys/RIOT,kaspar030/RIOT,kYc0o/RIOT,kYc0o/RIOT,authmillenon/RIOT,OlegHahm/RIOT,jasonatran/RIOT,jasonatran/RIOT,OTAkeys/RIOT,jasonatran/RIOT,miri64/RIOT,authmillenon/RIOT,kaspar030/RIOT,OlegHahm/RIOT,kaspar030/RIOT,ant9000/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,ant9000/RIOT,OTAkeys/RIOT,authmillenon/RIOT,ant9000/RIOT,ant9000/RIOT,RIOT-OS/RIOT,ant9000/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,jasonatran/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,miri64/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,kaspar030/RIOT,kaspar030/RIOT,miri64/RIOT