using a DNS server with an IPv6 address.

It seems that immediately the back of an IPv6 address will not be
normally recognized if it is not "\n" when using a DNS server with an
IPv6 address.
collect dhcpv6-options

The "dhcpv6-options" option parameter corrected the bug which is not
reflected normally.
Merge pull request #7 from tea2ka/helium

Correction of a "DHCPv6Client"-related script for use with parameters only SLAAC