ethereum pos doc and some config naming

src/main/kotlin/io/emeraldpay/dshackle/config/UpstreamsConfig.kt

@@ -102,7 +102,7 @@ open class UpstreamsConfig {
         var host: String? = null
         var port: Int = 0
         var auth: AuthConfig.ClientTlsAuth? = null
-        var nodeRating: Int = 0
+        var upstreamRating: Int = 0
     }
 
     class EthereumConnection : RpcConnection() {
@@ -117,7 +117,7 @@ open class UpstreamsConfig {
 
     class EthereumPosConnection : UpstreamConnection() {
         var execution: EthereumConnection? = null
-        var blockPriority: Int = 0
+        var upstreamRating: Int = 0
     }
 
     data class BitcoinZeroMq(

src/main/kotlin/io/emeraldpay/dshackle/config/UpstreamsConfigReader.kt

@@ -107,7 +107,7 @@ class UpstreamsConfigReader(
                     val connection = UpstreamsConfig.GrpcConnection()
                     upstream.connection = connection
                     getValueAsInt(connConfigNode, "node-rating")?.let {
-                        connection.nodeRating = it
+                        connection.upstreamRating = it
                     }
                     getValueAsString(connConfigNode, "host")?.let {
                         connection.host = it
@@ -170,8 +170,8 @@ class UpstreamsConfigReader(
         getMapping(connConfigNode, "execution")?.let {
             connection.execution = readEthereumConnection(it)
         }
-        getValueAsInt(connConfigNode, "block-priority")?.let {
-            connection.blockPriority = it
+        getValueAsInt(connConfigNode, "node-rating")?.let {
+            connection.upstreamRating = it
         }
         return connection
     }

src/main/kotlin/io/emeraldpay/dshackle/startup/ConfiguredUpstreams.kt

@@ -159,7 +159,7 @@ open class ConfiguredUpstreams(
             return null
         }
         val urls = ArrayList<URI>()
-        val connectorFactory = buildEthereumConnectorFactory(execution, chain, urls, NoChoiceWithPriorityForkChoice(conn.blockPriority))
+        val connectorFactory = buildEthereumConnectorFactory(execution, chain, urls, NoChoiceWithPriorityForkChoice(conn.upstreamRating))
         val methods = buildMethods(config, chain)
         if (connectorFactory == null) {
             return null
@@ -256,7 +256,7 @@ open class ConfiguredUpstreams(
             endpoint.port,
             endpoint.auth,
             fileResolver,
-            endpoint.nodeRating
+            endpoint.upstreamRating
         ).apply {
             timeout = options.timeout
         }