Homa nominate validators

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 70.54264% with 38 lines in your changes are missing coverage. Please review.

Project coverage is 65.18%. Comparing base (16f147e) to head (0eae6d4).

Files	Patch %	Lines
modules/xcm-interface/src/lib.rs	0.00%	13 Missing :warning:
modules/homa/src/lib.rs	72.41%	8 Missing :warning:
modules/homa-validator-list/src/lib.rs	53.33%	7 Missing :warning:
modules/relaychain/src/lib.rs	20.00%	4 Missing :warning:
modules/support/src/lib.rs	0.00%	4 Missing :warning:
modules/nominees-election/src/lib.rs	96.61%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2734 +/- ## ========================================== - Coverage 65.35% 65.18% -0.18% ========================================== Files 69 67 -2 Lines 9808 9018 -790 ========================================== - Hits 6410 5878 -532 + Misses 3398 3140 -258 ```

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[wangjj9219]

should also integrate with nominees-election to allow LDOT holders to elect validators

reviewed the designs of nominee-election and homa-validator-list. They are similar. It seems that nominee-election is an earlier design. Later, there was the pallet homa-validator-list. Similarly, LDOT holders can give validators Votes to increase its guarantee, and the locked guarantee can be frozen and slashed through governance

Need to confirm, is the design of homa-validator-list enough to replace nominee-election? Does it need optimization, or some renaming?

[xlc]

This is the intended usage:

Validators what wish to become LDOT validators needs to register themselves using homa-validator-list and provide insurance deposit.

Then LDOT holders can nominate LDOT validators using nominee-election to pick the top X validators out of all registered validators from homa-validator-list

So the deposit for homa-validator-list can be low as they have to be top X picked by LDOT holders anyway

[wangjj9219]

This is the intended usage:

Validators what wish to become LDOT validators needs to register themselves using homa-validator-list and provide insurance deposit.

Then LDOT holders can nominate LDOT validators using nominee-election to pick the top X validators out of all registered validators from homa-validator-list

So the deposit for homa-validator-list can be low as they have to be top X picked by LDOT holders anyway

I understand, homa-validator-list serves as a filter, and the pick up logic should be placed in nominee-election, and homa read nominee from nominee-election.