Update git submodules

* Update docs/submodules/clover from branch 'stable/gambia'
  - Fix broken jmeter binary links

    - Docker container builds are failing due to expired links
    for the jmeter binary for jmeter-master and jmeter-slave
    - Updated link provided

    Change-Id: Icb364bc234b118e0c00359a04b51461142f832af
    Signed-off-by: earrage <eddie.arrage@huawei.com>
  - Merge "Add visibility API in controller and CLI" into stable/gambia
  - Merge "Add nginx services control functionality" into stable/gambia
  - Merge "Improve data ingestion reliability and functionality" into stable/gambia
  - Merge "Remove former check_envs call" into stable/gambia
  - Remove former check_envs call

    Else it raises exceptions in __init__().

    Change-Id: I4af1f59fbb9a94da1df132e750525fcdb5d0917b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
  - Add visibility API in controller and CLI

    - Modify get visibility to retrieve config and stats
    - Add visibility REST API in controller to clear, set, and
    get from redis
    - Add example yaml to set visibility (service list by name,
    metric suffixes/prefixes, and custom metrics) from CLI
    - Modify example yaml to start visibility (collector) for
    Istio 1.0 from CLI

    Change-Id: I43304ff6d70bb4b817b345b9c383ce3621fb06c7
    Signed-off-by: earrage <eddie.arrage@huawei.com>
  - Add spinnaker configguide

    - Supply manifest for creation PV
    - Add the spinnaker as a service documentation
    - set the ci.jenkins.enabled to false

    Change-Id: I66d91aa133085c6c5910913da4303c05fcba9800
    Signed-off-by: wutianwei <wutianwei1@huawei.com>
  - Add nginx services control functionality

    - Modify nginx server template to use clover-controller
    in clover-system namespace for file upload
    - Add ability to set nginx server paths and move uploaded files
    in clover-controller and set/get file upload metadata
    - Add cloverctl commands to set nginx server and lb configurations
    - Add example yaml files to configure nginx server and
    lb v1/v2 from cloverctl
    - Modify service definition for http-lb versions to distinguish
    the two versions for GRPC messaging from clover-controller in SDC
    deployment yaml

    Change-Id: I5c6866c5ff3de358939c58ea8c0bde64a69c6eca
    Signed-off-by: earrage <eddie.arrage@huawei.com>
  - Improve data ingestion reliability and functionality

    - Modify deployment namespace to clover-system and account
    for cassandra moving to the clover-system namespace
    - Increase k8s compute resource assigned to cassandra to deal
    with performance issues
    - Add additional fields (user-agent, request/response size,
    status codes) to span schema definition and modify primary keys
    - Improve exception handling to prevent collect process from
    crashing
    - Minor changes to support tracing/monitoring with Istio 1.0
    - Inhibit logging for debug messages
    - Increase time back and number of traces to fetch in
    each sampling interval to deal with Jaeger REST interface
    returning trace data out of order under load
    (tested to 300 conn/sec; 12K connections currently)
    - Move trace insert into batch mode to cassandra
    - Read visibility services to analyze from redis rather than
    defaults (cloverctl, UI or clover-controller REST will set)
    - Remove local directory copies in docker build, as image is
    based on base clover container

    Change-Id: Ibae98ef5057e52a6eeddd9ebbcfaeb644caec36c
    Signed-off-by: earrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index 8541bdc..6e5c74f 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit 8541bdcde5fdabf7689d2609adac982683b07558
+Subproject commit 6e5c74f40cecd61e216a2ba01dc0860eeab02347