Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [UCA] Stop enforcing repository architecture

    Let APT automatically choose the UCA/Pike-staging PPA architecture
    based on current system architecture instead of hardcoding it.

    Change-Id: I4fe645847ac0fb70a852477feba9f788fcb8da81
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 7f47d25..9cac611 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 7f47d25bc3a25ad2cdd564100cdc703ae85702b4
+Subproject commit 9cac6117a760279b6be83034f5634f5505032cc0