Implement CLI commands to view and delete SR internal stores

sr-next-dst (renamed from sr-next-hops)
sr-next-port
sr-next-vlan
sr-next-mcast (renamed from sr-mcast-next)
sr-next-pw
sr-next-xconnect
sr-next-invalidate <next-id>

Change-Id: Id5178f786bb97e26ddb86015105dd19604ac0817
17 files changed
tree: 345f042d20bcb97ed7834b905af055f0af53c261
  1. BUCK
  2. BUILD
  3. app/
  4. web/