Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - test_heat: ipaddress expects unicode inputs

    weird error

    E           AddressValueError: '10.20.0.0/15' does not appear to be an IPv4 or IPv6 network. Did you pass in a bytes (str in Python 2) instead of a unicode object?

    I guess we need to convert the stack.outputs mock to unicode

    FAILED
    tests/unit/benchmark/contexts/test_heat.py:137 (HeatContextTestCase.test_add_server_port)
    self = <tests.unit.benchmark.contexts.test_heat.HeatContextTestCase testMethod=test_add_server_port>

        def test_add_server_port(self):
            network1 = mock.MagicMock()
            network1.vld_id = 'vld111'
            network2 = mock.MagicMock()
            network2.vld_id = 'vld777'
            self.test_context.name = 'foo'
            self.test_context.stack = mock.MagicMock()
            self.test_context.networks = {
                'a': network1,
                'c': network2,
            }
            self.test_context.stack.outputs = {
                'b': '10.20.30.45',
                'b-subnet_id': 1,
                'foo-a-subnet-cidr': '10.20.0.0/15',
                'foo-a-subnet-gateway_ip': '10.20.30.1',
                'b-mac_address': '00:01',
                'b-device_id': 'dev21',
                'b-network_id': 'net789',
                'd': '40.30.20.15',
                'd-subnet_id': 2,
                'foo-c-subnet-cidr': '40.30.0.0/18',
                'foo-c-subnet-gateway_ip': '40.30.20.254',
                'd-mac_address': '00:10',
                'd-device_id': 'dev43',
                'd-network_id': 'net987',
            }
            server = mock.MagicMock()
            server.ports = OrderedDict([
                ('a', {'stack_name': 'b'}),
                ('c', {'stack_name': 'd'}),
            ])

            expected = {
                "private_ip": '10.20.30.45',
                "subnet_id": 1,
                "subnet_cidr": '10.20.0.0/15',
                "network": '10.20.0.0',
                "netmask": '255.254.0.0',
                "gateway_ip": '10.20.30.1',
                "mac_address": '00:01',
                "device_id": 'dev21',
                "network_id": 'net789',
                "network_name": 'a',
                "local_mac": '00:01',
                "local_ip": '10.20.30.45',
                "vld_id": 'vld111',
            }
    >       self.test_context.add_server_port(server)

    tests/unit/benchmark/contexts/test_heat.py:186:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    yardstick/benchmark/contexts/heat.py:307: in add_server_port
        network_name, port['stack_name'], self.stack.outputs)
    yardstick/benchmark/contexts/heat.py:315: in make_interface_dict
        subnet_ip = ipaddress.ip_network(subnet_cidr)
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    address = '10.20.0.0/15', strict = True

        def ip_network(address, strict=True):
            """Take an IP string/int and return an object of the correct type.

            Args:
                address: A string or integer, the IP network.  Either IPv4 or
                  IPv6 networks may be supplied; integers less than 2**32 will
                  be considered to be IPv4 by default.

            Returns:
                An IPv4Network or IPv6Network object.

            Raises:
                ValueError: if the string passed isn't either a v4 or a v6
                  address. Or if the network has host bits set.

            """
            try:
                return IPv4Network(address, strict)
            except (AddressValueError, NetmaskValueError):
                pass

            try:
                return IPv6Network(address, strict)
            except (AddressValueError, NetmaskValueError):
                pass

            if isinstance(address, bytes):
                raise AddressValueError(
                    '%r does not appear to be an IPv4 or IPv6 network. '
                    'Did you pass in a bytes (str in Python 2) instead of'
    >               ' a unicode object?' % address)
    E           AddressValueError: '10.20.0.0/15' does not appear to be an IPv4 or IPv6 network. Did you pass in a bytes (str in Python 2) instead of a unicode object?

    ../../yardstick/yardstick_venv/lib/python2.7/site-packages/ipaddress.py:199: AddressValueError

    Change-Id: Ie3b087a26a054203573eaa9b13c3e90152bba6a9
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 33b4394..7b4f2bd 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 33b439426dac57bc8448df1bb485138550235740
+Subproject commit 7b4f2bdb386eacd62f4f8e9e67d0c826adccc3b0