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CLOUDSTACK-9403 : Support for shared networks in Nuage VSP pluginThis is first phase of support of Shared Network in cloudstack through NuageVsp Network Plugin. A shared network is a type of virtual network that is shared between multiple accounts i.e. a shared network can be accessed by virtual machines that belong to many different accounts. This basic functionality will be supported with the below common use case: - shared network can be used for monitoring purposes. A shared network can be assigned to a domain and can be used for monitoring VMs belonging to all accounts in that domain. With the current implementation with NuageVsp plugin, Each shared network needs its unique IP address range, and can not overlap with another shared network. In VSD, it is implemented in below manner: - In order to have tenant isolation for shared networks, we will have to create a Shared L3 Subnet for each shared network, and instantiate it across the relevant enterprises. A shared network will only exist under an enterprise when it is needed, so when the first VM is spinned under that ACS domain inside that shared network. PR contents: 1) Support for shared networks with tenant isolation on master with Nuage VSP SDN Plugin. 2) Marvin test coverage for shared networks on master with Nuage VSP SDN Plugin. 3) Enhancements on our exiting Marvin test code (nuagevsp plugins directory). 4) PEP8 & PyFlakes compliance with our Marvin test code. * pr/1579: CLOUDSTACK-9403: Support for shared networks in Nuage VSP plugin Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>