Update git submodules

* Update docs/submodules/nfvbench from branch 'master'
  - Move to tag 1.2.2

    Change-Id: I358ebcb7528368ad68752c66810356b50caa482d
    Signed-off-by: ahothan <ahothan@cisco.com>

diff --git a/docs/submodules/nfvbench b/docs/submodules/nfvbench
index 0268d1a..298511b 160000 (submodule)
--- a/docs/submodules/nfvbench
+++ b/docs/submodules/nfvbench
@@ -1 +1 @@
-Subproject commit 0268d1ab252ebcb6d97c3009005a1e259aa512e4
+Subproject commit 298511bb572ffeb460f7ccbebe06233a17e6b794