This function is called from the supervisor at system start-up.
Inserts all data in the configuration files into the database and destroys all old data.
Thus, the data in the SNMP-FRAMEWORK-MIB, after this function has been called, is from the configuration files.
All snmp counters are set to zero.
If an error is found in the configuration file, it is reported using the function config_err/2 of the error report module, and the function fails with reason configuration_error.
ConfDir is a string which points to the directory where the configuration files are found.
The configuration file read is: context.conf.