Update git submodules

Update git submodules

* Update docs/submodules/portal.git from branch 'master'
  to 60e54d31cb84aad363897043f810b87ac0ceb5d1
  - Merge "Fix sonar issues in ecomp-portal-BE-common"
  - Fix sonar issues in ecomp-portal-BE-common

    A "NullPointerException" could be thrown
    Replace the type specification in this constructor call with the diamond operator ("<>")
    Use isEmpty() to check whether the collection is empty or not

    Issue-ID: PORTAL-562
    Change-Id: Idbff965861ec837f058bc0ae7073b359d0fcadcc
    Signed-off-by: Parshad Patel <pars.patel@samsung.com>