Update git submodules

* Update docs/submodules/aai/aai-common.git from branch 'master'
  to fff2d1af7b401d6334c4b09868597dcc6c054e2b
  - Merge "Update to spring-boot 1.5.21"
  - Update to spring-boot 1.5.21
    
    Issue-ID: AAI-2560
    Signed-off-by: Jimmy Forsyth <jf2512@att.com>
    Change-Id: Ifd9c4d10fe5bfcd3f23700557065ffa4d51e257a
    
1 file changed