@keithbostic The change to the API was to move most of the configuration parsing methods out of the extension API and into a new WT_CONFIG_PARSER handle. The handle has a lifetime similar to the previous config_scan handle, but is managed via a top-level API.

There is one method still in the extension API - which deals specifically with the WT_CONFIG_ARG that is specific to the extension API. The approximate mapping is:

```WT_EXTENSION->config_get``` is unchanged
```WT_EXTENSION->config_getstr``` becomes ```WT_CONFIG_PARSER->get```
```WT_EXTENSION->config_scan_next``` becomes ```WT_CONFIG_PARSER->next```