introduce new ServiceV2 API to handle guided restarts

[harshavardhana]

Community Contribution License

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under the terms of the Apache 2 license.
By creating this pull request I represent that I have the right to license the
contributions to the project maintainers under the Apache 2 license.

Description

introduce new ServiceV2 API to handle guided restarts

Motivation and Context

The new API now verifies any hung disks before restart/stop,
provides a 'per node' breakdown of the restart/stop results.

It also provides how many blocked syscalls are present on
the drives and what users must do about them.

Adds options to do pre-flight checks to provide information
to the user regarding any hung disks. Provides 'force' option
to forcibly attempt a restart() even with waiting syscalls
on the drives.

How to test this PR?

CI/CD tests have already been updated to use the new API. Needs
madmin-go/mc changes as well here, which I will be sending
subsequently.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[harshavardhana]

The new changes will be

mc admin service restart local
Restart command successfully sent to `local`. Type Ctrl-C to quit or wait to follow the status of the restart process.
┌────────────────┬───────────────────────┐
│ HOST           │ STATUS                │
├────────────────┼───────────────────────┤
│ localhost:9001 │ ✔                     │
│ localhost:9002 │ ✔                     │
│ localhost:9003 │ ✔                     │
│ localhost:9004 │ peer is not reachable │
└────────────────┴───────────────────────┘

...!!!
Restarted `local` successfully in 4 seconds```

In this form 

[vadmeste]

One comment

[krisis]

Overall, LGTM, except for a couple of minor comments.

[vadmeste]

LGTM