com.docker.slirp: don't skip the first allowed-bind-address value
com.docker.slirp: don't skip the first allowed-bind-address value

Previously this code would monitor changes but would fail to respect
the initial value (if there was one).

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@docker.com>

djs55/vpnkit,samoht/vpnkit,djs55/vpnkit,djs55/vpnkit