gmetad: off by one buffer overflow in request buffer
gmetad: off by one buffer overflow in request buffer

readline uses up to "maxlen" bytes to store the request that was passed
to it through the interactive port, so reserve 1 extra byte in the
request buffer for the terminator string.


git-svn-id: 27e0aca8c7a52a9ae65dfba2e16879604119af8c@1953 93a4e39c-3214-0410-bb16-828d8e3bcd0f

fastly/ganglia,fastly/ganglia,fastly/ganglia,fastly/ganglia,fastly/ganglia