Update git submodules

Update git submodules

* Update docs/submodules/modeling/modelspec.git from branch 'master'
  to 21d141cae1e75bac01c3b469addc59afc0af6a2e
  - Minor Updates to License

    Added Reference Stereotypes to all classes and datatypes indicating as
    built.   Also had to recreate License Key and Entitlement diagrams -
    they were frozen for some reason.   Also made slight updates to a couple
    class definitions.

    Issue-ID: MODELING-104

    Change-Id: Id92b97ab17a596605735a75a39ff1ead53b2b19c
    Signed-off-by: Kevin Scaggs <ks0567@att.com>