Update new-config templates to use USDT by default

freqtrade/templates/subtemplates/exchange_binance.j2

@@ -8,21 +8,6 @@
         "rateLimit": 200
     },
     "pair_whitelist": [
-        "ALGO/BTC",
-        "ATOM/BTC",
-        "BAT/BTC",
-        "BCH/BTC",
-        "BRD/BTC",
-        "EOS/BTC",
-        "ETH/BTC",
-        "IOTA/BTC",
-        "LINK/BTC",
-        "LTC/BTC",
-        "NEO/BTC",
-        "NXS/BTC",
-        "XMR/BTC",
-        "XRP/BTC",
-        "XTZ/BTC"
     ],
     "pair_blacklist": [
         "BNB/BTC",

freqtrade/templates/subtemplates/exchange_bittrex.j2

@@ -15,16 +15,6 @@
         "rateLimit": 500
     },
     "pair_whitelist": [
-        "ETH/BTC",
-        "LTC/BTC",
-        "ETC/BTC",
-        "DASH/BTC",
-        "ZEC/BTC",
-        "XLM/BTC",
-        "XRP/BTC",
-        "TRX/BTC",
-        "ADA/BTC",
-        "XMR/BTC"
     ],
     "pair_blacklist": [
     ]

freqtrade/templates/subtemplates/exchange_kraken.j2

@@ -7,28 +7,10 @@
     "ccxt_async_config": {
         "enableRateLimit": true,
         "rateLimit": 1000
+        // Enable the below for downoading data.
+        //"rateLimit": 3100
     },
     "pair_whitelist": [
-        "ADA/EUR",
-        "ATOM/EUR",
-        "BAT/EUR",
-        "BCH/EUR",
-        "BTC/EUR",
-        "DAI/EUR",
-        "DASH/EUR",
-        "EOS/EUR",
-        "ETC/EUR",
-        "ETH/EUR",
-        "LINK/EUR",
-        "LTC/EUR",
-        "QTUM/EUR",
-        "REP/EUR",
-        "WAVES/EUR",
-        "XLM/EUR",
-        "XMR/EUR",
-        "XRP/EUR",
-        "XTZ/EUR",
-        "ZEC/EUR"
     ],
     "pair_blacklist": [