Update git submodules

* Update docs/submodules/aaf/authz.git from branch 'master'
  to 2e1d7eaff96c341b41c9733662c65002c3ad11a5
  - Merge "Remove Unused Import"
  - Remove Unused Import

    The imports part of a file should be handled by the Integrated Development Environment (IDE), not manually by the developer.
    Unused and useless imports should not occur if that is the case.
    Leaving them in reduces the code's readability, since their presence can be confusing

    Change-Id: I05b40d390175827e6be72c400fa7084c9154b053
    Issue-ID: AAF-933
    Signed-off-by: anushadasari <danush10@in.ibm.com>