session: Keep brackets around ipv6 hostname
session: Keep brackets around ipv6 hostname

According to rfc2732:
"To use a literal IPv6 address in a URL, the literal address should be
enclosed in "[" and "]" characters."

Resolves: rhbz#1331777

Acked-by: Marc-André Lureau <f20011f729ce65c6b731da6d94357379565098f1@redhat.com>

fgouget/spice-gtk,fgouget/spice-gtk,flexVDI/spice-gtk,flexVDI/spice-gtk,fgouget/spice-gtk