Set default value for "state_path". #42
Merged
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Set default state_path to "acme_{issuer.name}" and introduce a special value "off" to revert to a stateless behavior.
As usual, relative paths in configuration are resolved against NGX_PREFIX. The NGX_ACME_STATE_PREFIX environment variable can be set during build to override this behavior. The way we take the option may look a bit unusual, but unfortunately there's no infra for adding module-specific options in auto/configure.
Fixes #32.