Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 8a3fb63de2bdf40bbf33119854d432693c2ff2e4
  - Merge "Externalize AssignPnf Building Block and refactor existing code accordingly"
  - Externalize AssignPnf Building Block and refactor existing code accordingly

    Issue-ID: SO-2568
    Change-Id: I1eec15862d6f0b5e8ae4c952b290be8d5fc786dd
    Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 44cb5d9..8a3fb63 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 44cb5d927a9730c28807557360bad0e61ef4b626
+Subproject commit 8a3fb63de2bdf40bbf33119854d432693c2ff2e4