Workaround docker test issue

Author: breskeby

qa/packaging/src/test/java/org/elasticsearch/packaging/util/docker/Docker.java

@@ -75,12 +75,15 @@ public class Docker {
     public static final int STARTUP_SLEEP_INTERVAL_MILLISECONDS = 1000;
     public static final int STARTUP_ATTEMPTS_MAX = 30;
 
+    /**
+     * The length of the command exceeds what we can use for COLUMNS so we use
+     * a workaround to find the process we're looking for
+     */
     private static final String ELASTICSEARCH_FULL_CLASSNAME = "org.elasticsearch.bootstrap.Elasticsearch";
     private static final String FIND_ELASTICSEARCH_PROCESS = "for pid in $(ps -eo pid,comm | grep java | awk '\\''{print $1}'\\''); "
         + "do cmdline=$(tr \"\\0\" \" \" < /proc/$pid/cmdline 2>/dev/null); [[ $cmdline == *"
         + ELASTICSEARCH_FULL_CLASSNAME
         + "* ]] && echo \"$pid: $cmdline\"; done";
-    // The length of the command exceeds what we can use for COLUMNS so we use a pipe to detect the process we're looking for
 
     /**
      * Tracks the currently running Docker image. An earlier implementation used a fixed container name,