Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 308c3c2085864e04848e53a589773ff2e6e2c76a
  - Merge "DB Schema Change for SO Catalog"
  - DB Schema Change for SO Catalog

    Support PNF and VNF with CDS Meta data
    Add new table for PNF resource/resource customization
    add support for blueprint name/version
    https://jira.onap.org/browse/SO-1606

    Issue-ID: SO-1606
    Change-Id: I6b8a438be1139859d1902197816dbb8cbcfc095f
    Signed-off-by: eeginux <henry.xie@est.tech>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index c068ba1..308c3c2 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit c068ba17e06cc1aab0616c4ad11f8be8c2d23e45
+Subproject commit 308c3c2085864e04848e53a589773ff2e6e2c76a