Update git submodules

* Update docs/submodules/armband from branch 'master'
  - docs: armband: master: Jumpserver min libvirt version

    This is a copy of installation.instruction.rst
    from fuel to armband repo on master branch

    JIRA: ARMBAND-337

    Change-Id: Ib5d942c0d2d159037ab563c79a926220c726a5a9
    Signed-off-by: ting wu <ting.wu@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 35a70c1..7c7cc0b 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 35a70c18b46c83f7e4990ffce5f41bf7f534a8b2
+Subproject commit 7c7cc0baae89b0c017d64e41f1317ed48a80ecbd