Adopt to upstream changes

The symbols were moved to different packages:
169470: MetaDataUpdate
169477: ProjectConfig
Change-Id: I3b92e4dc391985d2046c40f0f367344ea94846f0

src/main/java/com/googlesource/gerrit/plugins/download/command/project/DownloadCommandUpdater.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/download/command/project/DownloadCommandUpdater.java b/src/main/java/com/googlesource/gerrit/plugins/download/command/project/DownloadCommandUpdater.java
index 7fc1631..1a2556d 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/download/command/project/DownloadCommandUpdater.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/download/command/project/DownloadCommandUpdater.java
@@ -25,10 +25,10 @@
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.reviewdb.client.RefNames;
 import com.google.gerrit.server.config.PluginConfig;
-import com.google.gerrit.server.git.MetaDataUpdate;
-import com.google.gerrit.server.git.ProjectConfig;
 import com.google.gerrit.server.git.WorkQueue;
+import com.google.gerrit.server.git.meta.MetaDataUpdate;
 import com.google.gerrit.server.project.ProjectCache;
+import com.google.gerrit.server.project.ProjectConfig;
 import com.google.gerrit.server.project.ProjectState;
 import com.google.inject.Inject;
 import com.google.inject.Provider;