Improve cisco_ios show_standby

[lamiskin]

ISSUE TYPE

• Additional Testing

COMPONENT

ntc_templates/templates/cisco_ios_show_standby.textfsm
cisco_ios
show standby

SUMMARY

Newly captured fields:

• INTERFACE
• STATE_CHANGES
• STATE_LAST_CHANGE
• SECONDARY_IPS - List of IPs
• FLAGS
• TRACK_ITEM
• TRACK_TYPE - Can be interface or object depending on config.
• TRACK_STATE
• TRACK_DECREMENT_TIME

Updated ACTIVE_ROUTER and STANDBY_ROUTER to allow unknown as a value.

Added new tests for the new fields.
Updated existing test with newly captured fields.

Example of some of the new fields.

  - interface: "GigabitEthernet0/1.2951"
    group: "1"
    version: "2"
    state: "Active"
    state_changes: "2"
    state_last_change: "3y37w"
    virtual_ip: "111.222.230.17"
    secondary_ips: []
    active_virtual_mac: "0000.0c9f.f001"
    local_virtual_mac: "0000.0c9f.f001"
    hello_time: "3"
    hold_time: "10"
    authentication: ""
    preemption: "enabled"
    active_router: "local"
    active_router_priority: ""
    active_router_mac: ""
    standby_router: "unknown"
    standby_router_priority: ""
    priority: "255"
    group_name: "hsrp-Gi0/1.2951-1"
    flags: ""
    track_item: "1"
    track_type: "object"
    track_state: ""
    track_decrement_time: ""