Update git submodules

* Update plugins/hooks from branch 'master'
  to aa4252417f54e28db3a7fa1f98d9a06d8ce49465
  - Merge branch 'stable-2.15'
    
    * stable-2.15:
      Log a warning when a hook exits with error status
      Include hook name in error message when logging output failed
      Log a warning when a hook times out
      Use Logger's built-in string formatting
    
    Change-Id: Iac58aca64c9699f28ea105850e9fdefbea1e3e64
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Log a warning when a hook exits with error status
      Include hook name in error message when logging output failed
      Log a warning when a hook times out
      Use Logger's built-in string formatting
    
    Change-Id: I8dbc6b71eb46adfcd06b0e64684d78d33c327110
    
  - Log a warning when a hook exits with error status
    
    The hook's exit status and output were always logged, but only at
    debug level.
    
    Change it so that when the exit status is an error (non-zero) it is
    logged at warning level.
    
    Change-Id: I4e7079a897e0d88b3c69f392f634096f477f7780
    
  - Include hook name in error message when logging output failed
    
    Change-Id: I1eb5343ba08baef82023b94f22cea0819e97b864
    
  - Log a warning when a hook times out
    
    Change-Id: I71bf3ec5f2c85470ff91b7afe80a82a2df0c42e3
    
  - Use Logger's built-in string formatting
    
    Change-Id: Ia888e1f27069d556ada7283c20e837c19be61424
    
diff --git a/plugins/hooks b/plugins/hooks
index 1bcd255..aa42524 160000
--- a/plugins/hooks
+++ b/plugins/hooks
@@ -1 +1 @@
-Subproject commit 1bcd25599cd37a50c15d8ac9fe98785ce96337a0
+Subproject commit aa4252417f54e28db3a7fa1f98d9a06d8ce49465