Update git submodules

* Update docs/submodules/externalapi/nbi.git from branch 'master'
  to 54f4f123ca4fd37ded22dc7887a4bb7bb468f01b
  - Merge "Add DMaaP Integration to retrieve AAI-EVENT"
  - Add DMaaP Integration to retrieve AAI-EVENT
    
    Change-Id: I94e5eec12fe22b1785a00de530e080a842f37a40
    Issue-ID: EXTAPI-201
    Signed-off-by: aosull01 <adrian.osullivan@huawei.com>
    
diff --git a/docs/submodules/externalapi/nbi.git b/docs/submodules/externalapi/nbi.git
index e0e7ba6..54f4f12 160000
--- a/docs/submodules/externalapi/nbi.git
+++ b/docs/submodules/externalapi/nbi.git
@@ -1 +1 @@
-Subproject commit e0e7ba60753556c5a135ebc057ad3780cddacb28
+Subproject commit 54f4f123ca4fd37ded22dc7887a4bb7bb468f01b