Upgrade to Atomix 3.0.0-rc7 to use agent distribution

Change-Id: I368ea95456553518bd627b1f4197442535186158
diff --git a/tools/package/features/BUCK b/tools/package/features/BUCK
index 8bbf94a..4b5ecd7 100644
--- a/tools/package/features/BUCK
+++ b/tools/package/features/BUCK
@@ -11,6 +11,7 @@
     '//lib:atomix-raft',
     '//lib:atomix-storage',
     '//lib:atomix-utils',
+    '//lib:classgraph',
     '//lib:commons-lang',
     '//lib:commons-lang3',
     '//lib:commons-text',