Update git submodules

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

    - Added a container named clover-collector using clover
    container as a base with build script
    - GRPC server to manage collector process
    - Cassandra DB client interface to initialize visibility keyspace
    - Init messaging adds table schemas for tracing - traces & spans
    - Adds table for monitoring - metrics
    - Does not implement Cassandra server but developed using
    public Cassandra docker container
    - Collector process in simple loop that periodically fetches
    traces and monitoring data and inserts to Cassandra - not optimized
    for batch retrieval yet for monitoring
    - CLI interface added to collector process and used
    by GRPC server for configuration
    - Simple GRPC client script to test GRPC server and start/stop
    of collector process
    - Collector process can be configured with access for tracing,
    monitoring and Cassandra
    - Added a return value in monitoring query method

    - Added ability to truncate tracing, metrics and spans tables
    in cql
    - Added cql prepared statements and batch insert for metrics
    and spans
    - Align cql connection to cql deployment within k8s
    - Fix issue with cql host list using ast and collect process
    args with background argument
    - Added redis interface to accept service/metric list
    externally for monitoring (will work in conjunction
    with clover-controller)
    - Use k8s DNS names and default ports for monitoring, tracing
    and cassandra
    - Added yaml manifest renderer/template for collector

    Change-Id: I3e4353e28844c4ce9c185ff4638012b66c7fff67
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index 4ee3a54..0254cb2 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit 4ee3a546bb8f7739804177590824eb73ed7593e1
+Subproject commit 0254cb223d2eace1eaf295eacf4cea4fc4fd9844