Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - tag dovetail with 0.6.0

    docker image used
    opnfv/yardstick: danube.3.2
    opnfv/functest: cvp.0.5.0
    opnfv/bottlenecks: cvp.0.4.0
    opnfv/testapi: cvp.0.6.0
    opnfv/dovetail:web.cvp.0.6.0
    opnfv/dovetail:api.cvp.0.6.0
    opnfv/dovetail: cvp.0.6.0
    main changes
    Merge all test specification docs about test area tempest and defcore
    Merge addendum doc and workflow doc
    Remake aarch64 patch for Dovetail container
    Remove some tempest test cases that are not too common
    Add additional Tempest API test cases into test case tempest.tc005
    persist db file in host for mongo container
    add nginx to host static files
    add a sample tempest_conf.yaml file into userconfig
    Add a patch to set ha SLA to be 30 seconds
    Modify logs
    Bugfix: the config files in useeconfig will cover user's config
    Bugfix: functest only keeps the last test case's log
    Bugfix: pre_condition cmds is just executed once
    For more information, refer to https://wiki.opnfv.org/display/dovetail/Running+history+for+the+dovetail+tool

    JIRA: DOVETAIL-497

    Change-Id: I74626bbf65ce0121cc7b53394c85694e15df8484
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 3840725..0aacdce 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 38407258e849fe630a1443fb71181b1b2b27ee90
+Subproject commit 0aacdceeeac62333651ec5440fb32af965c7689e