Update git submodules

Update git submodules

* Update docs/submodules/portal.git from branch 'master'
  to b475a63d78de90cb89301e3830a61b6fe2a723f0
  - Merge "Sonar fix: make "dateFormat" an instance variable"
  - Sonar fix: make "dateFormat" an instance variable

    Fixed critical Sonar issue. SimpleDateFormat was declared as a static
    but it is not tread-safe and it keeps an internal state.
    Compliant solution has been applied with additional DateUtil class.

    Issue-ID: PORTAL-590
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: Ic6243052804a410cb750c6c219c702469c86ff78