Update git submodules

Update git submodules

* Update docs/submodules/bottlenecks from branch 'stable/danube'
  - Update document according to Danube release plan

    JIRA: BOTTLENECK-145

    Currently, the docs of Bottlenecks still follow the format
    from Colorado. Some work need to be done regarding reorganizing
    the contents according to the Danube release.

    Change-Id: I4ece51abc558bb7128565125224b5e8579a198f7
    Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>
    (cherry picked from commit 566a7246d6a8e9451be511ddae84f7067bf013ea)

  - Bugfix: set docker api version to 1.24

    JIRA: BOTTLENECK-146

    Set docker api version to 1.24

    Change-Id: Id05527e628c7fa6ff3382bd68741bd36fc706fe6
    Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>
    (cherry picked from commit 4b36a57727cad302976ee38ad0046a7595339849)

  - Bugfix: fix docker version to 2.1.0

    JIRA: BOTTLENECK-146

    Fix the docker API library to 2.1.0

    Change-Id: I4cf2801db2adc28325a587411f802515176e8d03
    Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>
    (cherry picked from commit 3a3bb4df2db4f58d3e76dcdd41b3327bd2094eb3)

  - Bugfix: fix docker version instead of API version

    JIRA: BOTTLENECK-146

    In 31527, API version is 1.24, docker version should be 1.12

    Change-Id: I529f16372aaa00b4fc802344b559453677b7b560
    Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>
    (cherry picked from commit 2f1f35479f0449d4b91eb5c28e94a50af202e18f)

  - bugfix: docker client version newer than docker server

    JIRA: BOTTLENECK-146

    Docker client is needed in Bottlenecks docker for the purpose to
    use docker command within docker.
    The inconsistence of docker client version with
    docker server version causing building falure.

    Change-Id: Ib4ecf9c40db5492438b27550636413e5f3a69ea3
    Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>
    (cherry picked from commit 136b188b4713f4ec2a20d6a09b4284a02f520aa3)

  - Update docs structure according to Danube agreement

    JIRA: BOTTLENECK-141

    docs.opnfv.org has trouble indexing all the testing docs.
    So testing projects have to adjust the docs structure.

    Change-Id: I586b2c1626ca4fb8e1980130e132e6079a0977a7
    Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>
    (cherry picked from commit 3bc1b97e2a594959a9966c6f967e50fa33d2893b)

  - Update test suite running entrance

    JIRA: BOTTLENECK-142

    Update the entrance for POSCA test suite.Currently, test case
    selection for POSCA is not support for this entrance.
    The function will be added later.
    For Rubbos and VSTF, after OPNFV Colorado release,
    they are not updating anymore. This entrance for running them
    within Bottlenecks is no longer supported.
    These testsuites are also not in the release plan with Bottlenecks
    since then. If you want to run Rubbos and VSTF,
    please refer to ealier releases.

    Change-Id: Idaf7da147489c6371e46ac3234179133762a05cd
    Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>
    (cherry picked from commit fc9a89857e121c2015a34e49c441cb234fa10c13)