Update git submodules

* Update docs/submodules/calipso from branch 'master'
  - Added index file

    the index file is needed to enable docs on docs.opnfv.org

    Change-Id: I13225ecbab52491128c781bdd8f86aaf137de64d
    Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>

diff --git a/docs/submodules/calipso b/docs/submodules/calipso
index 7cba262..22f979b 160000 (submodule)
--- a/docs/submodules/calipso
+++ b/docs/submodules/calipso
@@ -1 +1 @@
-Subproject commit 7cba26258ea17f790028a7005cb9bbbdc3923389
+Subproject commit 22f979b8d5a6861457f9c5a94f83c359f48a7ed4