Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Merge "Change the default packages url from compass http server to opnfv artifacts"
  - Change the default packages url from compass http server to opnfv artifacts

    JIRA: COMPASS-544

    Currently compass4nfv uses compass http server to store those packages used in
    building ISO. This is not propriate in OPNFV community. So we push all the packages
    into opnfv artifacts repo and change the package url used in compass to opnfv
    artifacts repo url.

    Change-Id: I9661f2d893767e18c037ba9de5f54933f48ce466
    Signed-off-by: Yifei Xue <xueyifei@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 12e9cbc..494ac58 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 12e9cbc43f59962cabc8f6fdfb0aec67dec02bd0
+Subproject commit 494ac5825c5b435d512cc13332e302efd30e2a6c