Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - [maas] Download only used subarches images

    - reduce download size/time for MaaS images by downloading only the
      subarch images we use;
    - fix stop condition in MaaS artifact download script;
    - stop importing images before updating the boot resources to prevent
      race conditions;

    Change-Id: I3b15fae3463bc6c54be2cc06e0cb31edcbd307cb
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 7f797f1b5a9340d24d700879abca6b39413e7375)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 58615ef..e29220a 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 58615ef93be91652da9dcef3ac797d11c5cc7e88
+Subproject commit e29220a401a5ad0607453d6a82de9b61d1c02aca