Update git submodules

* Update docs/submodules/compass4nfv from branch 'stable/euphrates'
  - Fix centos kickstart_done snippet

    Bug:
    CentOS-7-Minimal-1611-x86_64 image doesn't contain
    wget package and kickstart_done snippet use wget to
    call cobbler api to set netboot enable to false.
    This way if host installed centos which is not set
    to boot from disk will stuck in pxe loop

    Solution:
    Use curl instead of wget in kickstart_done

    Change-Id: I0414adab72047a367b7cb15fe6a5537c76234972
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>
    (cherry picked from commit 08a15a8dae520e2b02748a34ff1ec034ee6806b9)

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 2d9022a..179ef51 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 2d9022a663ec99102c86a1c6efffe20b99495b02
+Subproject commit 179ef51116c86a6a68a3e963ba5a02d72552b776