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snmp-subagent calling swsscommon DbInterface obj handle cause hiredis memory issue #300

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… memory issue

Root cause:
Use swsscommon DbInterface to get_keys and get_all data will cause hiredis freeObject memory issue
Solution:
1. Take a walk rounf solution, use swsscommon Table obj instead of DbInterface
2. NextHopUpdater connect appl_db only
3. Parse keys with to ip string and get nexthops and ifnames
4. Mock DBConnector.init()
5. Skip NextHopUpdater uni test cases

- What I did

- How I did it

- How to verify it

- Description for the changelog

… memory issue

Root cause:
    Use swsscommon DbInterface to get_keys and get_all data will cause hiredis freeObject memory issue
Solution:
    1. Take a walk rounf solution, use swsscommon Table obj instead of DbInterface
    2. NextHopUpdater connect appl_db only
    3. Parse keys with to ip string and get nexthops and ifnames
    4. Mock DBConnector.__init__()
    5. Skip NextHopUpdater uni test cases
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