Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[minion] Set tcp_keepalive for flaky networks"
  - [minion] Set tcp_keepalive for flaky networks

    Workaround issues like [1]. Requires bumping formulas for
    salt-formula-salt support of tcp_keepalive_* params.

    [1] https://github.com/saltstack/salt/issues/38157

    Change-Id: I7093437fb696809f73a24b10144c6321d0f1be32
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 02a91b3..c616950 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 02a91b3f16f31052b0a6ef867ddc9a3d8e305c71
+Subproject commit c616950d0a9e1b1e453a902c6454200c3b2ad6b7