Update git submodules

Update git submodules

* Update docs/submodules/clamp.git from branch 'master'
  to b31ee1c9c566ae070c214e9a26beefb9fc939ff9
  - Merge "Add check to maven pom.xml for verifying integrity of ui-react-lib"
  - Add check to maven pom.xml for verifying integrity of ui-react-lib

    A new shell script is introduced for verifying that
    ui-react-lib/libIndex.js is faithfully synchronized with components
    maintained in ui-react/src, in order to provide an NPM onap-clamp-ui-lib

    Issue-ID: CLAMP-669
    Change-Id: I48eb979e3fbe110b718b96c0fcee08a2ced7a36b
    Signed-off-by: Ted Humphrey <Thomas.Humphrey@att.com>