Update git submodules

* Update docs/submodules/pharos from branch 'stable/fraser'
  - [fuel] Parameterize tenant VLAN ranges

    - IDF: convert all tenant VLANs to ranges;
    - IA: convert 'M-N' to 'M:N' for `opnfv_net_tenant_vlan`;

    Change-Id: Ic9211235281c81ba082d10806651c35116ba4c35
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit c7034503e2bb8da20f2b5c678719c7c7fbe6e61f)

diff --git a/docs/submodules/pharos b/docs/submodules/pharos
index 02a3385..3b4966e 160000 (submodule)
--- a/docs/submodules/pharos
+++ b/docs/submodules/pharos
@@ -1 +1 @@
-Subproject commit 02a3385322bad418f2b16854983546a59c3cf919
+Subproject commit 3b4966edd70da0f46f5695d0799f57f35d7fcd55