runtests.pl: fix startup of IPv6 servers
Commit curl-7_23_1-143-g82180643 changed the parameter of responsive_http_server to accept types other than IPv6 (converting from a boolean to a string), but only considered the lower-case "ipv6" and not the "IPv6" variant. This caused all servers to start in IPv4 mode instead. This patch converts the remaining cases to "ipv6". While not strictly necessary for the run*server variants, these got also converted for consistency and to prevent future errors. Signed-off-by: Peter Wu <peter@lekensteyn.nl>
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