Update git submodules

* Update plugins/plugin-manager from branch 'master'
  to 7d9562b29c8ae277595a1e9c6a18c1018252cd16
  - CorePluginsRepository: Convert to streams and lambdas
    
    Change-Id: If26858a4c3ba6e814d19252702af0dab95e037b6
    
diff --git a/plugins/plugin-manager b/plugins/plugin-manager
index b4aad55..7d9562b 160000
--- a/plugins/plugin-manager
+++ b/plugins/plugin-manager
@@ -1 +1 @@
-Subproject commit b4aad554e56d9359fc0b17997f260169f685c7f2
+Subproject commit 7d9562b29c8ae277595a1e9c6a18c1018252cd16