Modify API for calling SNMP reltaed CLI

As the ticket: https://arraynetworks.atlassian.net/browse/TWSD-1146,

There is changes in CLI.

Original:

snmp host <host_ip> [version] [user_name|community_name] [engine_id] [auth_password] [authorization_level] [priv_password] [port] [auth_proto] [priv_proto]

After changes:

snmp host <host_ip> [version] [user_name|community_name]
snmp auth <host_ip> <engine_id> <auth_password> [security_level] [privacy_password] [trap_port] [auth_algo] [encryption_algo]

So I first modify code for calling two CLI for each version of SNMP Server code.

Please check attachment for original changes code(Original_code_for_V1orV2_insert and Original_code_for_V3_for_insert).

Then I found the dataTable is crashed, so I fixed the get data part.

Please check attachment for original changes code(Original_code_for_V1orV2_for_get_data and Original_code_for_V3_for_get_data).
While organizing my code,

I found the code is simalar between code for SNMP Version 1 or 2 and SNMP Version 3,

so I merged the code under the class Server.
I have tested all situation for the insert and show data successfully.

Besides,

I also check the delete function is okay.