Update git submodules

Update git submodules

* Update docs/submodules/clover from branch 'master'
  - Merge "Initial commit for tracing"
  - Initial commit for tracing

    - Uses REST interface to obtain traces for services from Jaeger
    - Discover services availabe in tracing
    - Works only with Jaeger at the moment (not zipkin)
    - Optional Redis interface added to store traces per test
    - Install doc and validation script added for Jaeger

    - Renamed doc to docs

    Change-Id: I420137c818df290ecd40aa8d318c6961c511a947
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>