Load SCBE backend on startup and implement the Activate Interface

[shay-berman]

• Load the SCBE backend during the Ubiquity server start up
• Add the relevant SCBE config parameters
• Implement SCBE backend Activate interface. The Activate should login to SCBE and to validate that the default service is actually available.
• Enable default values to few parameters : Port=8440, VerifySSL=true

How to test good path :

1. configure ubiquity server.conf as here with ScbeConfig tags. (make sure you have the directory mentioned in SpectrumScaleConfig.configPath, yes for now we took the config from this param)
   Make sure u have SCBE up and running with one service delegated to the interface, and also configure this service as the default one.

2. Run ubiquity server and make sure you see "scbe init start" and "scbe init end" in the log file (by default /tmp/ubiquity.log)

3. Configure the ubiquity DVP(docker volume plugin) conf file (make sure you have the directory /etc/docker/plugins).
   make sure to remove the [SpectrumNfsRemoteConfig] tag so it will use the SCBE backend and not SScNFS

4. Run the ubiquity DVP

5. Now simulate DVP activation by just trigger this command:
   #> curl -X POST http://127.0.0.1:9000/Plugin.Activate
   Verify : you should see in the log file that scbe activation line : "scbe remoteClient: Activate success"

[midoblgsm]

@shay-berman , please take a look at this and let me know what do you think commit. The idea is, if a backend is specified in the activate call, we will activate just the specified backend. If the backend is not specified, we will activate all backend.