[rpc] Remove priority information from mempool RPC calls

"startingpriority" and "currentpriority" are no longer returned in the
JSON information about a mempool entry.  This affects
getmempoolancestors, getmempooldescendants, getmempooolentry, and
getrawmempool.

src/rpc/blockchain.cpp

@@ -400,8 +400,6 @@ static std::string EntryDescriptionString()
            "    \"modifiedfee\" : n,      (numeric) transaction fee with fee deltas used for mining priority\n"
            "    \"time\" : n,             (numeric) local time transaction entered pool in seconds since 1 Jan 1970 GMT\n"
            "    \"height\" : n,           (numeric) block height when transaction entered pool\n"
-           "    \"startingpriority\" : n, (numeric) DEPRECATED. priority when transaction entered pool\n"
-           "    \"currentpriority\" : n,  (numeric) DEPRECATED. transaction priority now\n"
            "    \"descendantcount\" : n,  (numeric) number of in-mempool descendant transactions (including this one)\n"
            "    \"descendantsize\" : n,   (numeric) size of in-mempool descendants (including this one)\n"
            "    \"descendantfees\" : n,   (numeric) modified fees (see above) of in-mempool descendants (including this one)\n"
@@ -419,8 +417,6 @@ static void entryToJSON(UniValue &info, const CTxMemPoolEntry &e)
     info.pushKV("modifiedfee", ValueFromAmount(e.GetModifiedFee()));
     info.pushKV("time", e.GetTime());
     info.pushKV("height", (int)e.GetHeight());
-    info.pushKV("startingpriority", e.GetPriority(e.GetHeight()));
-    info.pushKV("currentpriority", e.GetPriority(chainActive.Height()));
     info.pushKV("descendantcount", e.GetCountWithDescendants());
     info.pushKV("descendantsize", e.GetSizeWithDescendants());
     info.pushKV("descendantfees", e.GetModFeesWithDescendants());