Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to c55a88d9e00399708cd6c5ea7b562ca579aabbfe
  - Merge "remove not used BaseTask class"
  - remove not used BaseTask class
    
    BaseTask class serves only as JavaDelegate implementation provider, should be removed
    
    Change-Id: I46f56cb850d12e4ef395db9429297d05f3a51b37
    Issue-ID: SO-2187
    Signed-off-by: Lukasz Muszkieta <lukasz.muszkieta@nokia.com>
    
diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 74cd017..c55a88d 160000
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 74cd0172784a38f8d45b09b543804df4bb66a304
+Subproject commit c55a88d9e00399708cd6c5ea7b562ca579aabbfe