Revert "Use pluginName variable to read from config"

Revert submission 452805

Reason for revert: This change broke UpdateGitMetricsTaskTest

Reverted changes: /q/submissionid:452805

Change-Id: Icff17e816b503137b62ff8e9b091e001a38de1f3

src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsConfig.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsConfig.java b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsConfig.java
index 6d54801..bd80489 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsConfig.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsConfig.java
@@ -41,18 +41,18 @@
   }
 
   public Long getGracePeriodMs() {
-    return config.getTimeUnit(pluginName, null, "gracePeriod", 0L, TimeUnit.MILLISECONDS);
+    return config.getTimeUnit("git-repo-metrics", null, "gracePeriod", 0L, TimeUnit.MILLISECONDS);
   }
 
   public boolean isForcedCollection() {
-    return config.getBoolean(pluginName, "forcedCollection", false);
+    return config.getBoolean("git-repo-metrics", "forcedCollection", false);
   }
 
   public int getPoolSize() {
-    return config.getInt(pluginName, null, "poolSize", 1);
+    return config.getInt("git-repo-metrics", null, "poolSize", 1);
   }
 
   public GitBackend getGitBackend() {
-    return config.getEnum(pluginName, null, "gitBackend", GitBackend.GERRIT);
+    return config.getEnum("git-repo-metrics", null, "gitBackend", GitBackend.GERRIT);
   }
 }