message: Make getaddressinfo return solvability
diff: @@ -3538,6 +3538,7 @@ UniValue getaddressinfo(const JSONRPCRequest& request)
  " \"address\" : \"address\", (string) The bitcoin address validated\n"
  " \"scriptPubKey\" : \"hex\", (string) The hex-encoded scriptPubKey generated by the address\n"
  " \"ismine\" : true|false, (boolean) If the address is yours or not\n"
  + " \"solvable\" : true|false, (boolean) If the address is solvable by the wallet\n"
  " \"iswatchonly\" : true|false, (boolean) If the address is watchonly\n"
  " \"isscript\" : true|false, (boolean) If the key is a script\n"
  " \"iswitness\" : true|false, (boolean) If the address is a witness address\n"
  @@ -3592,6 +3593,7 @@ UniValue getaddressinfo(const JSONRPCRequest& request)
  isminetype mine = IsMine(*pwallet, dest);
  ret.pushKV("ismine", bool(mine & ISMINE_SPENDABLE));
  ret.pushKV("iswatchonly", bool(mine & ISMINE_WATCH_ONLY));
  + ret.pushKV("solvable", IsSolvable(*pwallet, scriptPubKey));
  UniValue detail = DescribeWalletAddress(pwallet, dest);
  ret.pushKVs(detail);
  if (pwallet->mapAddressBook.count(dest)) {
  