Update git submodules

* Update docs/submodules/yardstick from branch 'stable/gambia'
  - fix yardstick verify job

    The regex is not compatible with pip version 18.

    JIRA: INFRA-310

    Change-Id: I6eaf1e3fac183f85c277934929e9065efa88d877
    Signed-off-by: rexlee8776 <limingjiang@huawei.com>
    (cherry picked from commit a4084d27de22c64ecb690369c7bed49175703adf)

  - Update Ixia tg to use new API for traffic model creation

    JIRA: YARDSTICK-1464

    Change-Id: Ibbced9e0e04e077ec5c23fc15e97308dd11b7004
    Signed-off-by: Serhiy Pshyk <serhiyx.pshyk@intel.com>
    (cherry picked from commit 81ed5cdea4c36d45c6463523c6a0bc38495e544a)

  - Merge "Fix influxdb "field type conflict" error" into stable/gambia
  - Merge "Fix NSB PROX L3FWD dropping packets" into stable/gambia
  - Merge "NSB PROX NFVi Test does not stop after reaching expected precision" into stable/gambia
  - Fix NSB PROX L3FWD dropping packets

    JIRA: YARDSTICK-1037

    Adjusted number of RX/TX descriptors to 2048, instead of default 256,
    in order to cope with interrupts during which no packets are received
    by the core, which results in the NIC dropping packets when it gets out
    of available descriptors to buffer them.
    Also adjusted mempool size, because more descriptors need more mbufs.

    This change aligns L3FWD test case with other test cases, for which
    number of RX/TX descriptors is already set to 2048.

    Change-Id: I11378c078398aca799295b619bb3d14dbee04ca3
    Signed-off-by: Patrice Buriez <patrice.buriez@intel.com>
    (cherry picked from commit 3adfba6bac0133bdbaa3db62e16f662e11d84fb8)

  - Merge "Modify IxNextgen API for traffic model configuration" into stable/gambia
  - Fix influxdb "field type conflict" error

    JIRA: YARDSTICK-1457

    Field types must be consistent across points in a measurement, otherwise
    influxdb rejects newer points with "field type conflict" error.

    This error was faced when "theor_max_throughput" field, meant to be
    assigned as a float from "TxThroughput" sample, was instead assigned as
    an int from initial value of theor_max_thruput variable. This especially
    occured for subsequent packet sizes, when theor_max_thruput variable was
    reset to its default int value.

    This fix changes the default value of theor_max_thruput variable to 0.0,
    and also makes sure that the default value for "Actual_throughput" field
    is consistently a float.

    Change-Id: If8d4f1297094709fe9657ab3e2b8adaad09815b2
    Signed-off-by: Patrice Buriez <patrice.buriez@intel.com>
    (cherry picked from commit 2f4418798a3cf245f863a617410403f226062ac8)

  - NSB PROX NFVi Test does not stop after reaching expected precision

    JIRA: YARDSTICK-1419

    When using prox_binsearch algorithm, a binary search is
    performed, increasing lower bound when step was successful
    and decreasing upper bound when the step was a failure.

    This runs until the test_precision (as specified in the
    traffic profile) is reached. When the test precision
    is reached, the test is not completed until the
    runner duration is reached.

    As runner duration is usually high (e.g. 1800sec), the
    tests take much too long to execute.
    This makes it difficult to create test suites.

    Change-Id: I6cc503a09fb534a556c61c805e6df4786bb8cc4b
    Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
    (cherry picked from commit 7d5ff45a3b793f5e50b4a32b2438ab11fed6c899)

  - Modify IxNextgen API for traffic model configuration

    Changes to IxNextgen API:
     - modify API for traffic model configuration so that it can be used
       to create/configure different models
     - add methods to start and stop protocols on IxNetwork
     - add method for getting assigned ports

    JIRA: YARDSTICK-1455

    Change-Id: I43c10fea9ba83994caf373ceff8b0252a45439b3
    Signed-off-by: Serhiy Pshyk <serhiyx.pshyk@intel.com>
    (cherry picked from commit 7237241a396871d637f9906c1fc93a8587a7b726)

  - Update the pinned sampleVNF version

    JIRA: YARDSTICK-1414

    Updated the sampleVNF version to the most recent validated commit.
    Provided comments on accepted version types and values, and on where
    users can find alternative values, in case they want to try something
    different than the version recommended and validated for Yardstick/NSB.

    Change-Id: I336f96237fcfa8b580c91c787d722d368cc6c015
    Signed-off-by: Patrice Buriez <patrice.buriez@intel.com>
    (cherry picked from commit ee5d6413dbcbab40234e47ed3e74b85b704d6493)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index d63664d..e0b7c0a 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit d63664d5cea2b9f3e609158d983f2033e60e7ec9
+Subproject commit e0b7c0ad95d44eea4db4a3fb532f51688c97c8fc