Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 20a24c8e780890d4e63b281e5de16080d322bf17
  - Merge "Create Pre Building Block validator"
  - Create Pre Building Block validator

    Use Flowvalidator shouldRunFor method to check if flow needs to be
    validated.
    Create Pre Building Block validator to check if cloud-region
    orchestration-disabled is true

    Change-Id: I2f1dca16c97505292d9b99f7e206713e4963261f
    Issue-ID: SO-1534
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 75a0957..20a24c8 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 75a0957c5d544bf96bbcfba1594d1e23b417a01e
+Subproject commit 20a24c8e780890d4e63b281e5de16080d322bf17