mod_netconf: url-capability edit-config

optional json parameter 'source' can be set to 'config' (default value
if missing) or to 'url'

add json parameters:
'uri-source' (needed when source is 'url')

- refs #1362
diff --git a/src/README b/src/README
index 71b62db..936ca83 100644
--- a/src/README
+++ b/src/README
@@ -99,8 +99,10 @@
 key: config (string), value: editing configuration data according to NETCONF RFC
 
 Optional:
+key: source (string), value: config|url, default value: config
 key: default-operation (string), value: merge|replace|none
 key: error-option (string), value: stop-on-error|continue-on-error|rollback-on-error 
+key: uri-source (string), required when "source" is "url", value: uri
 
 6) NETCONF <copy-config>
 key: type (int), value: 9