nginx: Change reverse proxy DNS resolving.
nginx: Change reverse proxy DNS resolving.

Using a variable in the proxy_pass directive forces nginx to either use
a resolver or an upstream directive. This means that nginx no longer
fails when it cannot resolve the upstream host on startup, but rather
queries the specified resolver at runtime.

whatevsz/salt-states,whatevsz/salt-states,whatevsz/salt-states-parameterized,whatevsz/salt-states-parameterized