Add handling multiple VRRP instances in dashboard

Changes:
  - add "vrrp" dropdown ("All" allowed)
    used for "keepalived_state" metric's "name" label
  - added VRRP instance "name" in row title
  - decreased single stat panels width
    for better view of many instances
  - changed null->NONE mapping for VRRP state

Change-Id: If48120bbc481143fc295c4e5b8ed81c22d484144
Related-bug: PROD-24587 (PROD:24587)
1 file changed