Optimize container creation for node

[YoungHypo]

The function of "def _conversion_msp_tls_cfg(self, type, org, node)" from node/views.py is compress/zip important files or certificates such as node's msp, tls, etc., and pass them in for decompression/unzip when creating containers

This operation can be optimized to eliminate the compression and decompression process

For the function of "def create_node()" from agent/docker-test-agent/server.py, We can modify the mapping relationship of the container's volumes so that the container maps to a local file about the node.

for example,

volumes = [
    'LOCAL_NODE_FILE': /opt/cello/fabric
]

[yeasy]

The api-engine and agent may exist in different hosts.