Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 587e939a4248e3e5a53b84b9d263c5c47bc6bbc0
  - openecomp-be code coverage increase

    Add tests for classes in generator.datatypes.tosca package

    Change-Id: Ic21b4e05d15e881016fa5f25113625bc441924c9
    Issue-ID: SDC-2326
    Signed-off-by: Piotr Darosz <piotr.darosz@nokia.com>

diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index 7b10cc4..587e939 160000 (submodule)
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit 7b10cc4d95582dfaf6c6010199fa95aae78c806b
+Subproject commit 587e939a4248e3e5a53b84b9d263c5c47bc6bbc0