Let URI build the URI since hostname= auto-wraps an ipv6 address in [].

https://trello.com/c/NoHDPqHH
Backport "Regression in support for IPv6 literals in URIs with Net::HTTP"

https://github.com/ruby/ruby/commit/f01485b4ec97d6bbc462f6c7210b2499a97ce398
https://bugs.ruby-lang.org/issues/9129

https://trello.com/c/NoHDPqHH
WIP: use temporary branches for rest-client and ovirt for ipv6 fixes.

https://github.com/rest-client/rest-client/pull/332
https://github.com/ManageIQ/ovirt/pull/16

https://trello.com/c/NoHDPqHH