Remove two deprecated flags (#6757)

[ti-chi-bot]

This is an automated cherry-pick of #6757

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Remove two deprecated flags.
Now tidb-server has following flags:

Usage of ./tidb-server:
  -L string
        log level: info, debug, warn, error, fatal (default "info")
  -P string
        tidb server port (default "4000")
  -V    print version information and exit (default false)
  -advertise-address string
        tidb server advertise IP
  -affinity-cpus string
        affinity cpu (cpu-no. separated by comma, e.g. 1,2,3)
  -config string
        config file path
  -config-check
        check config file validity and exit (default false)
  -config-strict
        enforce config file validity (default false)
  -cors string
        tidb server allow cors origin
  -enable-binlog
        enable generate binlog (default false)
  -help
        show the usage
  -host string
        tidb server host (default "0.0.0.0")
  -lease string
        schema lease duration, very dangerous to change only if you know what you do (default "45s")
  -log-file string
        log file path
  -log-slow-query string
        slow query file path
  -metrics-addr string
        prometheus pushgateway address, leaves it empty will disable prometheus push.
  -metrics-interval uint
        prometheus client push interval in second, set "0" to disable prometheus push. (default 15)
  -path string
        tidb storage path (default "/tmp/tidb")
  -plugin-dir string
        the folder that hold plugin (default "/data/deploy/plugin")
  -plugin-load string
        wait load plugin name(separated by comma)
  -proxy-protocol-header-timeout uint
        proxy protocol header read timeout, unit is second. (default 5)
  -proxy-protocol-networks string
        proxy protocol networks allowed IP or *, empty mean disable proxy protocol support
  -repair-list string
        admin repair table list
  -repair-mode
        enable admin repair mode (default false)
  -report-status
        If enable status report HTTP service. (default true)
  -require-secure-transport
        require client use secure transport
  -run-ddl
        run ddl worker on this tidb-server (default true)
  -socket string
        The socket file to use for connection.
  -status string
        tidb server status port (default "10080")
  -status-host string
        tidb server status host (default "0.0.0.0")
  -store string
        registered store name, [tikv, mocktikv, unistore] (default "unistore")

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)
• v4.0 (TiDB 4.0 versions)
• v3.1 (TiDB 3.1 versions)
• v3.0 (TiDB 3.0 versions)
• v2.1 (TiDB 2.1 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 642da6e