listchannels: add funding_outnum to listchannels

Changelog-Added: JSONRPC: `listchannels` now includes the `funding_outnum`

doc/lightning-listpeers.7.md

@@ -55,6 +55,7 @@ On success, an object containing **peers** is returned.  It is an array of objec
   - **short_channel_id** (short_channel_id, optional): The short_channel_id (once locked in)
   - **channel_id** (hex, optional): The full channel_id (always 64 characters)
   - **funding_txid** (txid, optional): ID of the funding transaction
+  - **funding_outnum** (u32, optional): The 0-based output number of the funding transaction which opens the channel
   - **initial_feerate** (string, optional): For inflight opens, the first feerate used to initiate the channel open
   - **last_feerate** (string, optional): For inflight opens, the most recent feerate used on the channel open
   - **next_feerate** (string, optional): For inflight opens, the next feerate we'll use for the channel open
@@ -376,4 +377,4 @@ Main web site: <https://github.com/ElementsProject/lightning> Lightning
 RFC site (BOLT \#9):
 <https://github.com/lightningnetwork/lightning-rfc/blob/master/09-features.md>
 
-[comment]: # ( SHA256STAMP:956a13291bebc808bf1505a5d2030280aca441c5ca9991a6baae70c8715429a4)
+[comment]: # ( SHA256STAMP:444080f602bbce7d86bc7c38a4a2b1186a31c63d6b747d92c5aa4711dd9118c1)

doc/schemas/listpeers.schema.json

@@ -235,6 +235,10 @@
                   "type": "txid",
                   "description": "ID of the funding transaction"
                 },
+                "funding_outnum": {
+                  "type": "u32",
+                  "description": "The 0-based output number of the funding transaction which opens the channel"
+                },
                 "initial_feerate": {
                   "type": "string",
                   "description": "For inflight opens, the first feerate used to initiate the channel open"
@@ -741,6 +745,7 @@
                       "short_channel_id": {},
                       "channel_id": {},
                       "funding_txid": {},
+                      "funding_outnum": {},
                       "close_to": {},
                       "private": {},
                       "opener": {},
@@ -826,6 +831,7 @@
                       "short_channel_id": {},
                       "channel_id": {},
                       "funding_txid": {},
+                      "funding_outnum": {},
                       "inflight": {},
                       "close_to": {},
                       "private": {},
@@ -913,6 +919,7 @@
                       "short_channel_id": {},
                       "channel_id": {},
                       "funding_txid": {},
+                      "funding_outnum": {},
                       "inflight": {},
                       "close_to": {},
                       "private": {},
@@ -1000,6 +1007,7 @@
                       "short_channel_id": {},
                       "channel_id": {},
                       "funding_txid": {},
+                      "funding_outnum": {},
                       "close_to": {},
                       "private": {},
                       "opener": {},