Add public_key to the "vl" method response:

The "/vl" HTTP endpoint can be used to request a particular
UNL from a rippled instance.

This commit, if merged, includes the public key of the requested
list in the response.

This commit fixes #3392

src/ripple/app/misc/impl/ValidatorList.cpp

@@ -820,10 +820,11 @@ ValidatorList::getAvailable(boost::beast::string_view const& pubKey)
 
     Json::Value value(Json::objectValue);
 
-    value["manifest"] = iter->second.rawManifest;
-    value["blob"] = iter->second.rawBlob;
-    value["signature"] = iter->second.rawSignature;
-    value["version"] = iter->second.rawVersion;
+    value[jss::public_key] = std::string{pubKey};
+    value[jss::manifest] = iter->second.rawManifest;
+    value[jss::blob] = iter->second.rawBlob;
+    value[jss::signature] = iter->second.rawSignature;
+    value[jss::version] = iter->second.rawVersion;
 
     return value;
 }

src/ripple/protocol/jss.h

@@ -142,6 +142,7 @@ JSS(base_fee_xrp);           // out: NetworkOPs
 JSS(bids);                   // out: Subscribe
 JSS(binary);                 // in: AccountTX, LedgerEntry,
                              //     AccountTxOld, Tx LedgerData
+JSS(blob);                   // out: ValidatorList
 JSS(books);                  // in: Subscribe, Unsubscribe
 JSS(both);                   // in: Subscribe, Unsubscribe
 JSS(both_sides);             // in: Subscribe, Unsubscribe

src/test/app/ValidatorList_test.cpp

@@ -26,6 +26,7 @@
 #include <ripple/protocol/SecretKey.h>
 #include <ripple/protocol/Sign.h>
 #include <ripple/protocol/digest.h>
+#include <ripple/protocol/jss.h>
 #include <test/jtx.h>
 
 namespace ripple {
@@ -570,6 +571,21 @@ class ValidatorList_test : public beast::unit_test::suite
             BEAST_EXPECT(trustedKeys->listed(val.signingPublic));
         }
 
+        const auto hexPublic =
+            strHex(publisherPublic.begin(), publisherPublic.end());
+
+        const auto available = trustedKeys->getAvailable(hexPublic);
+
+        if (BEAST_EXPECT(available))
+        {
+            auto const& a = *available;
+            BEAST_EXPECT(a[jss::public_key] == hexPublic);
+            BEAST_EXPECT(a[jss::blob] == blob2);
+            BEAST_EXPECT(a[jss::manifest] == manifest1);
+            BEAST_EXPECT(a[jss::version] == version);
+            BEAST_EXPECT(a[jss::signature] == sig2);
+        }
+
         // do not re-apply lists with past or current sequence numbers
         BEAST_EXPECT(
             ListDisposition::stale ==