Update git submodules

* Update docs/submodules/calipso from branch 'master'
  - revert some docs changes from last commit by Koren

    table fixes by Aric Gardner in docs/release/admin-guide.rst
      were accidentaly destroyed
    files were accidentaly removed: docs/index.rst, docs/release/index.rst

    Change-Id: I9f826f524efd3e1af596055f0f16433551a918eb
    Signed-off-by: Yaron Yogev <yaronyogev@gmail.com>

diff --git a/docs/submodules/calipso b/docs/submodules/calipso
index 98c3ac7..c6c19c9 160000 (submodule)
--- a/docs/submodules/calipso
+++ b/docs/submodules/calipso
@@ -1 +1 @@
-Subproject commit 98c3ac7c859e34fe60d061b9ca591aba429e4118
+Subproject commit c6c19c9d08794f947bd4b48b85a4ff9f18d56634