elm test config - ensure buffer does't get overfilled with lots of profs

elm test config - ensure buffer does't get overfilled with lots of profs

the "let's use strncpy" brigade of course made sure to use it to "be
secure" and yet still overtflow the buffer... this is a perfect lesson
in DOP NOT USE strncpy unless you carefully think about the code and
get it right. i mean things like:

   strncat(buf, profiles[i], strlen(profiles[i]) + 1);

is blindly using strncpy ... and it's no better than strcpy, but mroe
complex and giving the illusion of "it's safe". pay attention to your
code people. please. thanks.