Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "maas: region: credentials workaround, force sync"
  - maas: region: credentials workaround, force sync

    Workaround the issues described in [1], stating that salt-formula-maas
    package cannot set an autogenerated PostgreSQL password, respectively
    the known error thrown during initial setup.

    FIXME: These should be reverted later, after fixing the MaaS password
    update and initial artifact sync in the salt formula / scripts.

    [1] https://docs.mirantis.com/mcp/1.0/mcp-deployment-guide/\
        install-base-infra/set-up-bare-metal-provisioner/configure-maas-vm.html

    Change-Id: I8b37f55d3caa4119c64f9549578850dd4eb9e3ad
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index f8137ae..9720ddf 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit f8137ae0ea1c41c2e37a7ccd2a5d4b65a37e5dba
+Subproject commit 9720ddf955b76d678a08dc7ea53684400c659ce3