TestServiceTemplateNodeRunner: Use 127.0.0.1 instead of localhost
The name "localhost" can resolve to an IPv4 or IPv6 address but the
test server appears to only listen on IPv4, so ensure that the tests
use the IPv4 loopback address.
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The name "localhost" can resolve to an IPv4 or IPv6 address but the
test server appears to only listen on IPv4, so ensure that the tests
use the IPv4 loopback address.