problem: using "upstreams" on two levels of config is confusing

README.adoc

@@ -76,7 +76,7 @@ proxy:
     - id: kovan
       blockchain: kovan
 
-upstreams:
+cluster:
   upstreams:
     - id: infura-eth
       chain: ethereum

demo/quick-start/dshackle.yaml

@@ -3,7 +3,7 @@ port: 2449
 tls:
   enabled: false
 
-upstreams:
+cluster:
   upstreams:
     - id: infura-eth
       chain: ethereum

docs/02-quick-start.adoc

@@ -29,7 +29,7 @@ proxy:
       blockchain: ethereum
     - id: kovan
       blockchain: kovan
-upstreams:
+cluster:
   upstreams:
     - id: infura-eth
       chain: ethereum

docs/03-server-config.adoc

@@ -16,7 +16,7 @@ tls:
   client:
     require: true
     ca: "ca.crt"
-upstreams:
+cluster:
   include: "upstreams.yaml"
 ----
 

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

@@ -38,7 +38,7 @@ class UpstreamsConfigReader(
     }
 
     override fun read(input: MappingNode?): UpstreamsConfig? {
-        return getMapping(input, "upstreams")?.let {
+        return getMapping(input, "cluster")?.let {
             readInternal(it)
         }
     }

src/test/resources/dshackle-full.yaml

@@ -34,7 +34,7 @@ proxy:
     - id: kovan
       blockchain: kovan
 
-upstreams:
+cluster:
   defaults:
     - chains:
         - ethereum