Support indirect mode VNFM

Registered by Yan Xing'an

ETSI defines direct/indidrect mode of VNFM to manage VNF-related Resources. Tacker vnfm use direct mode to interact with VIM. But in some usecases we need support indirect mode, to make tacker G-VNFM integrate with other NFVOs.

Reference:
1. ETSI GS NFV-IFA-010
  http://www.etsi.org/deliver/etsi_gs/NFV-IFA/001_099/010/02.02.01_60/gs_nfv-ifa010v020201p.pdf
2. ETSI GS NFV-IFA 007
  http://www.etsi.org/deliver/etsi_gs/NFV-IFA/001_099/007/02.01.01_60/gs_nfv-ifa007v020101p.pdf

3. https://docs.google.com/document/d/1jWj_k6Ctpr61N-GKsdfAq_YKnP83L6h7wHFKma8ahXI/edit?usp=sharing

Blueprint information

Status:
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Priority:
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Drafter:
Yan Xing'an
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Definition:
New
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Implementation:
Unknown
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