Update git submodules

* Update plugins/replication from branch 'stable-3.3'
  to 5ddc976586c8da17fd93e7b3d3ee54122421ec21
  - Merge branch 'stable-3.2' into stable-3.3
    
    * stable-3.2:
      ReplicationIT: Remove unnecessary storage inspection
      ReplicationIT: Fix invalid replicationDelay setting
      Split replication plugins tests in two groups
    
    Change-Id: I24aae9834c518518539dae0e20106c74de1d714b
    
  - Merge branch 'stable-3.1' into stable-3.2
    
    * stable-3.1:
      ReplicationIT: Remove unnecessary storage inspection
      ReplicationIT: Fix invalid replicationDelay setting
      Split replication plugins tests in two groups
    
    Change-Id: Ib43f744124114097e650e5991489bc87ef087dbd
    
  - Merge branch 'stable-3.0' into stable-3.1
    
    * stable-3.0:
      ReplicationIT: Remove unnecessary storage inspection
      ReplicationIT: Fix invalid replicationDelay setting
      Split replication plugins tests in two groups
    
    Change-Id: I9dfa3abd4907d74415bff6b77fc9ae49b9f6735f
    
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      ReplicationIT: Remove unnecessary storage inspection
      ReplicationIT: Fix invalid replicationDelay setting
      Split replication plugins tests in two groups
    
    Change-Id: I2d27b715a2bfc9832ee559556d1c8acfe671d893
    
  - ReplicationIT: Remove unnecessary storage inspection
    
    Integration tests shouldn't need to rely on inspecting the underlying
    ReplicationTasksStorage layer(s). All of these tests already verify the
    expected end result.
    
    This leaves 4 tests that currently completely rely on inspecting the
    task storage to verify the expected result. Those tests need further
    improvement to decouple from the storage layer.
    
    Change-Id: I029d63ce7d07414d9bf5d9290d556378beedcabf
    
  - ReplicationIT: Fix invalid replicationDelay setting
    
    Setting config values for a remote in replication.config vs the remote's
    own config file results in the replication.config values being ignored.
    Fix this by setting the values in each remote's config file.
    
    This test had delays added to avoid any flakiness, but the delays
    weren't working because of this issue. While the test generally passes,
    the delay makes it safer from races.
    
    Change-Id: Idcdf5f07b3fc91724068ec6216527665c4a48bb3
    
  - Split replication plugins tests in two groups
    
    Run unit-tests and integration tests in parallel by splitting
    them into two separate tasks.
    
    This also allows to potentially identify which group of tests
    is flaky, because Bazel would flag one or the other in case of
    instability.
    
    Change-Id: I21f969a17e3653dfc5ab93d71cc6955024fc2d8f
    
diff --git a/plugins/replication b/plugins/replication
index bc47d23..5ddc976 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit bc47d238733981d957a820f4c66f7128fca80663
+Subproject commit 5ddc976586c8da17fd93e7b3d3ee54122421ec21