Update git submodules

* Update docs/submodules/orchestra from branch 'master'
  - Added release notes for 5.1.0

    Change-Id: I318e2e21d83c214b21e8ca4ab25b79458c55945f
    Signed-off-by: Giuseppe Carella <cargius@gmail.com>

diff --git a/docs/submodules/orchestra b/docs/submodules/orchestra
index 9cf364f..30b6247 160000 (submodule)
--- a/docs/submodules/orchestra
+++ b/docs/submodules/orchestra
@@ -1 +1 @@
-Subproject commit 9cf364f27fd08431bfbcd58d43a5bbc18739bcb9
+Subproject commit 30b62474866c11465c9ae15af740378cde2c5e4e