Update git submodules

* Update docs/submodules/so/libs.git from branch 'master'
  to 19db86afe558e9f3cde3b307be97b80f7453fdbf
  - Merge "Revome unused code, comments and imports."
  - Revome unused code, comments and imports.
    
    Revome unused code, comments and imports.
    
    Issue-ID: SO-1490
    
    Change-Id: Ic3ef27ba76d06f2f90c4d2bf4128897c049dee83
    Signed-off-by: Isaac Manuel Raj <isaac.manuelraj@huawei.com>
    
diff --git a/docs/submodules/so/libs.git b/docs/submodules/so/libs.git
index 9da28cf..19db86a 160000
--- a/docs/submodules/so/libs.git
+++ b/docs/submodules/so/libs.git
@@ -1 +1 @@
-Subproject commit 9da28cf54bfb57f9af672d6ca29014f475eea68d
+Subproject commit 19db86afe558e9f3cde3b307be97b80f7453fdbf