Update git submodules

* Update docs/submodules/externalapi/nbi.git from branch 'master'
  to ca20793652dc0df6c25cdde9e2bbe007c0efebbe
  - Add index html and update remaining swagger for NBI
    Issue-ID: EXTAPI-402
    Signed-off-by: aosull01 <adrian.osullivan@huawei.com>
    Change-Id: I5746fd31f14c106bb85983af987ef0e71910e20d
    
diff --git a/docs/submodules/externalapi/nbi.git b/docs/submodules/externalapi/nbi.git
index d72257c..ca20793 160000
--- a/docs/submodules/externalapi/nbi.git
+++ b/docs/submodules/externalapi/nbi.git
@@ -1 +1 @@
-Subproject commit d72257cd1b886b2fbc0e01036542a763640b0b5f
+Subproject commit ca20793652dc0df6c25cdde9e2bbe007c0efebbe