Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 3a28b9af8d08fc2cf8d9af9b38578fd034999dc2
  - Remove powermock from ValidationConfigManagerTest
    
    - Remove powermock reference from ValidationConfigManagerTest
    
    Issue-ID: SDC-3064
    Signed-off-by: Rodrigo Lima  <rodrigo.lima@yoppworks.com>
    Change-Id: Ib330b0fcaf132e5d67f65b482a80b5b75f8c336b
    
diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index 6ff5f15..3a28b9a 160000
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit 6ff5f15cd520b2414768b12ecc3cd4638b200352
+Subproject commit 3a28b9af8d08fc2cf8d9af9b38578fd034999dc2