Update git submodules

* Update docs/submodules/parser from branch 'master'
  - Merge "Support costum datatype in capability"
  - Support costum datatype in capability

    Support custom datatype definition in property for capability,
    a scenario if following:

    VDU:
       type: tosca.nodes.nfv.VDU.Compute
       capabilities:
          virtual_compute:
               properties:
                  virtual_memory:
                      virtual_mem_size: 24G
                  requested_additional_capabilities: {}
                  virtual_cpu:
                      num_virtual_cpu: 4
    node_types:
      tosca.nodes.nfv.VDU.Compute:
        derived_from: tosca.nodes.Root
        capabilities:
          virtual_compute:
            type: tosca.capabilities.nfv.VirtualCompute

    capability_types:
      tosca.capabilities.nfv.VirtualCompute:
        derived_from: tosca.capabilities.Root
        properties:
          virtual_memory:
            type: tosca.datatypes.nfv.VirtualMemory
          requested_additional_capabilities:
            entry_schema:
              type: tosca.datatypes.nfv.RequestedAdditionalCapability
            required: false
            type: map
          virtual_cpu:
            type: tosca.datatypes.nfv.VirtualCpu

    This patch will be submitted to Openstack.

    JIAR: PARSER-135

    Change-Id: I7b5e3e909e0950de26b37123938fe719004d5417
    Signed-off-by: shangxdy <shang.xiaodong@zte.com.cn>

diff --git a/docs/submodules/parser b/docs/submodules/parser
index 02a18bd..59e3768 160000 (submodule)
--- a/docs/submodules/parser
+++ b/docs/submodules/parser
@@ -1 +1 @@
-Subproject commit 02a18bd6ede4fc1f8d67f3fc97a82349146a24b6
+Subproject commit 59e3768ddbb38c31c43d9a626124b923cd0ac8d8