Add vCPE with Tosca vnf INT doc

Issue-ID: INT-748
Change-Id: Ia44e3ce40a34fb6191f9c8c06cfca92671bcdccd
Signed-off-by: yangyan <yangyanyj@chinamobile.com>

diff --git a/docs/docs_vCPE with Tosca VNF.rst b/docs/docs_vCPE with Tosca VNF.rst
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+vCPE with Tosca VNF
+----------------------------
+
+VNF Packages and NS Packages 
+~~~~~~~~~~~~
+
+- VNF packages: https://wiki.onap.org/display/DW/vCPE+with+Tosca+VNF+Test+Guide
+- NS packages: https://wiki.onap.org/display/DW/vCPE+with+Tosca+VNF+Test+Guide
+
+Description
+~~~~~~~~~~~
+The vCPE with Tosca VNF shows how to use ONAP to deploy tosca based vCPE. ONAP Casablanca release supports deployment,termination and manual heal Tosca based vCPE. User can trigger the above operation via UUI. and User can first chose Network serivce type and conrresponding service template in UUI and then UUI will directly invoke VF-C Northbound interfaces to do the life cycle management. In Casablanca release, we bypass SO, in the following release, we can add SO to the workflow. The main projects involved in this use case include: SDC, A&AI, UUI，VF-C, Multicloud，MSB, Policy，OOF.
+
+The original vCPE Use Case Wiki Page can be found here: https://wiki.onap.org/pages/viewpage.action?pageId=3246168
+
+How to Use
+~~~~~~~~~~
+Design Time:
+
+1) Because SDC doesn't export ETSI aigned VNF package and NS package, so in this release, we put the real ETSI aligned package as package artifact.
+2) When design Network service in SDC, should assign "gvnfmdriver" as the value of nf_type in Properties Assignment. so that VF-C can know will use gvnfm to manage VNF life cycle.
+
+Run Time:
+1) First onboard VNF/NS package from SDC to VF-C catalog in sequence.
+2) Trigger the NS operation via UUI
+
+More details can be fonud here: https://wiki.onap.org/display/DW/vCPE+with+Tosca+VNF+Test+Guide
+
+Test Status and Plans
+~~~~~~~~~~~~~~~~~~~~~
+This case completed all tests as found here: https://wiki.onap.org/display/DW/vCPE+with+TOSCA+VNF+Integration+Test++-+Test+status
+
+Known Issues and Resolutions
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+1) VF-C catalog config should be updated with the right SDC URL and user/pwd
+
+Resolution: Disable VFC catalog livenessprobe and update configuration
+
+- edit dev-vfc-catalog deployment
+- remove livenessprobe section
+- enter into catalog pod and update configuration
+kubectl -n onap exec -it dev-vfc-catalog-6978b76c86-87722  /bin/bash
+config file location: service/vfc/nfvo/catalog/catalog/pub/config/config.py 
+Update the SDC configuration as follows:
+SDC_BASE_URL = "http://msb-iag:80/api"
+SDC_USER = "aai"
+SDC_PASSWD = "Kp8bJ4SXszM0WXlhak3eHlcse2gAw84vaoGGmJvUy2U"
+
+2) nfvtosca parser bug
+
+nfvtoscaparse has error when parse sdc distribution package.
+To ignore that error, we need either apply the patch at https://jira.opnfv.org/browse/PARSER-187 locally in nfv-toscaparser which VFC uses or wait for nfv-toscaparser got that fixed. 
+
+3) grant error patch
+https://gerrit.onap.org/r/#/c/73833/
+https://gerrit.onap.org/r/#/c/73770/
+
+4) vnflcm notification error patch
+https://gerrit.onap.org/r/#/c/73852/
+