[vtadmin-api] Rename flag 'http-tablet-fqdn-tmpl' to 'http-tablet-url-tmpl' + update vtadmin flags for local example

[doeg]

Description

• Renames flag 'http-tablet-fqdn-tmpl' to 'http-tablet-url-tmpl' (since it requires the protocol)
• Updates the local example to include both http-tablet-url-tmpl and tablet-fqdn-tmpl flags

curl "http://localhost:14200/api/tablets" | jq .

{
  "result": {
    "tablets": [
      {
        "cluster": {
          "id": "local",
          "name": "local"
        },
        "tablet": {
          "alias": {
            "cell": "zone1",
            "uid": 100
          },
          "hostname": "localhost",
          "keyspace": "commerce",
          "shard": "0",
          "type": 1,
          "master_term_start_time": {
            "seconds": 1621541573
          }
        },
        "state": 1,
        "FQDN": "localhost:15100"
      },
      {
        "cluster": {
          "id": "local",
          "name": "local"
        },
        "tablet": {
          "alias": {
            "cell": "zone1",
            "uid": 101
          },
          "hostname": "localhost",
          "keyspace": "commerce",
          "shard": "0",
          "type": 2
        },
        "state": 1,
        "FQDN": "localhost:15101"
      },
      {
        "cluster": {
          "id": "local",
          "name": "local"
        },
        "tablet": {
          "alias": {
            "cell": "zone1",
            "uid": 102
          },
          "hostname": "localhost",
          "keyspace": "commerce",
          "shard": "0",
          "type": 3
        },
        "state": 1,
        "FQDN": "localhost:15102"
      }
    ]
  },
  "ok": true
}

curl "http://localhost:14200/api/experimental/tablet/zone1-102/debug/vars"

(Redacted most of the response, since it's really long.)

{"result":{"AppConnPoolActive":0,"AppConnPoolAvailable":40,"AppConnPoolCapacity":40,"AppConnPoolExhausted":0,"AppConnPoolIdleClosed":0,"AppConnPoolIdleTimeout":60000000000,"AppConnPoolInUse":0,"AppConnPoolMaxCap":40,"AppConnPoolWaitCount":0,"AppConnPoolWaitTime":0,"BackupIsRunning":{},

Related Issue(s)

N/A

Checklist

• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

N/A

[ajm188]

lgtm. thank you for taking this one!