Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "reclass: virtual: Factor out common infra config"
  - reclass: virtual: Factor out common infra config

    Change-Id: I669a81cf46a4ac988a1ea04c3b9d297ae67a0a62
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index e64bc77..66bc7b3 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit e64bc7753700798b6b72fae6b80f6aa332c53bf2
+Subproject commit 66bc7b3993bcea31d47cf32907b6b0a410e090f4