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libapache2-mos-wsgi to handle post requests

API changes

1. Handshake and key exchange between management server and SSVM.
2. new API GetUploadParams which takes all the params as the registertemplate/uploadvolume except for URL and  which returns all the required params in encoded form plus a post URL to be used to uploadVolume/registerTemplate
3. an api on SSVM to send post request directly. This will download the file to a tmp location on SSVM and call the agent with the encoded params.
4. an api/communication on SSVM from apache to agent. This will decode the params, verify them and then store the template/volume on secondary storage.

UI Changes

1. register template and upload volume UI should be able to accept "browse and upload" file. (can be new one or added as an option to the existing dialog)

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