Use og_server_cfg everywhere. Convert port to string to make it easy for the
dbi API since it expects a string. Remove legacy example configuration file.
This patch is a refactor for og_computer and og_dbi_get_computer_info.
It now uses fixed lenght strings to make it more reliable and avoid
errors if the DB is not returning a null ended string.
For the strings in og_computer we do not need to know the max size in
advance but instead we need to free up memmory using
og_dbi_free_computer_info(...) function.