Update git submodules

Update git submodules

* Update docs/submodules/msb/apigateway.git from branch 'elalto'
  to db79ebae502a9861b0d6cb5ee69cfbd88817fc2c
  - Update Release notes and documentation

    Issue-ID: MSB-379
    Signed-off-by: Huabing Zhao <zhao.huabing@zte.com.cn>
    Change-Id: I91cf5e2f607909d6ea84143030b12adfa0150ef1
    (cherry picked from commit ece4a2ed55aad0b782f4e77e2cab0b3a3c788136)

  - Merge "Update  El Alto version"
  - Merge "E release note"
  - Update  El Alto version

    Issue-ID: MSB-384
    Signed-off-by: Huabing Zhao <zhao.huabing@zte.com.cn>
    Change-Id: I6465984d6937968ef50bdd593352d13f1776fd8e

  - E release note

    Issue-ID: MSB-356
    Signed-off-by: Huabing Zhao <zhao.huabing@zte.com.cn>
    Change-Id: Ib4614f9090cd47b373314fdf4d0a16c65c4cab94