removing ipv6 from btcd compose. not required.

docker/btcd/docker-compose.yml

@@ -1,8 +1,6 @@
 version: '3'
 services:
   btcd:
-    sysctls:
-      - "net.ipv6.conf.all.disable_ipv6=0"
     image: indralabs/btcd
     volumes:
       - config:/etc/btcd
@@ -15,8 +13,6 @@ services:
       - "--rpcpass=simnet"
       - "--simnet"
   btcctl:
-    sysctls:
-      - "net.ipv6.conf.all.disable_ipv6=0"
     image: indralabs/btcctl
     volumes:
       - config:/etc/btcd:ro
@@ -36,14 +32,10 @@ volumes:
 networks:
   indranet:
     driver: bridge
-    driver_opts:
-      com.docker.network.enable_ipv6: "true"
     ipam:
       driver: default
       config:
         - subnet: 172.16.42.0/24
           gateway: 172.16.42.1
-        - subnet: 2001:3984:8333::/64
-          gateway: 2001:3984:8333::1
 
 # docker-compose -f docker/btcd/docker-compose.yml up