Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to a90f0e766ce933d0473d4148269e1caf80a53149
  - Merge "etsi-sol002-adapter's support for vserver"
  - etsi-sol002-adapter's support for vserver
    
    Include vserver.vserver-name in the DMaaP event
    
    Issue-ID: SO-2901
    Signed-off-by: Piotr Borelowski <p.borelowski@partner.samsung.com>
    Change-Id: I2fa32624b9626802a8645cac0f00259bd170a9aa
    
diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 49ac4a6..a90f0e7 160000
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 49ac4a666b59114844e90117c225e08994c9a94e
+Subproject commit a90f0e766ce933d0473d4148269e1caf80a53149