[PR] Overlay javaagent by pod annotation. [skywalking-swck]

[via GitHub]

weixiang1862 opened a new pull request, #105:
URL: https://github.com/apache/skywalking-swck/pull/105

   I use workload annotations to inject agent agent name and collector 
backend_service, I fount javaagent can not get the correct value:
   ```
   [root@15 ~]# kubectl get javaagent -A
   NAMESPACE     NAME                     PODSELECTOR    SERVICENAME            
BACKENDSERVICE
   gray-demo     app-consumer-javaagent   app=consumer   Your_ApplicationName   
127.0.0.1:11800
   ``` 
   
   So I add a method `injectConfigByPodAnnotations` after 
`injectConfigBySwAgent`, then javaagent_controller can overlay config by using 
pod annotations:
   ```
   [root@15 ~]# kubectl get javaagent -A
   NAMESPACE     NAME                     PODSELECTOR    SERVICENAME            
       BACKENDSERVICE
   gray-demo     app-consumer-javaagent   app=consumer   
cluster01-default::consumer   192.168.6.71:11800
   ```


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