Cleanup docker / docker-compose configs (netty#9473)

Motivation:

We should use the same java versions whenever we use CentOS 6 or 7 and also use the latest Java12 version

Modifications:

- Use same Java versions
- Use latest Java 12 version
- Remove old configs which are not used anymore

Result:

Docker cleanup

docker/README.md

@@ -10,10 +10,10 @@ cd /path/to/netty/
 docker-compose -f docker/docker-compose.yaml -f docker/docker-compose.centos-6.18.yaml run test
 ```
 
-## centos 7 with java 9
+## centos 7 with java 11
 
 ```
-docker-compose -f docker/docker-compose.yaml -f docker/docker-compose.centos-7.19.yaml run test
+docker-compose -f docker/docker-compose.yaml -f docker/docker-compose.centos-7.111.yaml run test
 ```
 
 etc, etc

docker/docker-compose.centos-6.110.yaml

@@ -7,7 +7,7 @@ services:
     build:
       args:
         centos_version : "6"
-        java_version : "openjdk@1.10.0-2"
+        java_version : "zulu@1.10.0-2"
 
   test:
     image: netty:centos-6-1.10

docker/docker-compose.centos-6.112.yaml

@@ -7,7 +7,7 @@ services:
     build:
       args:
         centos_version : "6"
-        java_version : "[email protected]1"
+        java_version : "[email protected]2"
 
   test:
     image: netty:centos-6-1.12

docker/docker-compose.centos-6.graalvm1.yaml

@@ -7,7 +7,7 @@ services:
     build:
       args:
         centos_version : "6"
-        java_version : "graalvm@19.0.0"
+        java_version : "graalvm@19.1.1"
 
   test:
     image: netty:centos-6-1.8

docker/docker-compose.centos-7.110.yaml

@@ -7,7 +7,7 @@ services:
     build:
       args:
         centos_version : "7"
-        java_version : "openjdk@1.10.0-2"
+        java_version : "zulu@1.10.0-2"
 
   test:
     image: netty:centos-7-1.10

docker/docker-compose.centos-7.112.yaml

@@ -7,7 +7,7 @@ services:
     build:
       args:
         centos_version : "7"
-        java_version : "[email protected]1"
+        java_version : "[email protected]2"
 
   test:
     image: netty:centos-7-1.12

docker/docker-compose.centos-7.19.yaml

@@ -7,7 +7,7 @@ services:
     build:
       args:
         centos_version : "7"
-        java_version : "openjdk@1.9.0-7"
+        java_version : "zulu@1.9.0-7"
 
   test:
     image: netty:centos-7-1.9