use setsockopt_string when setting a string as the option
use setsockopt_string when setting a string as the option

setsockopt() accepts, strictly, an int or a bytestring as the
option value. Here we want to use a string as the value, so we
should use setsockopt_string(). I checked all other uses and
they look to be using ints as the option values, so they're OK.

Without this fix, reading the first message from tail_messages
will blow up in Python 3.

chaiku/fedmsg,pombredanne/fedmsg,chaiku/fedmsg,fedora-infra/fedmsg,maxamillion/fedmsg,maxamillion/fedmsg,fedora-infra/fedmsg,fedora-infra/fedmsg,chaiku/fedmsg,pombredanne/fedmsg,pombredanne/fedmsg,maxamillion/fedmsg