native: unify committee checks

[fyrchik]

Fail execution if tx is not signed by committee.
Close #1694 .
Related #1678 (set/getprice test).

[codecov]

Codecov Report

Merging #1695 (4099901) into master (9a99054) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1695      +/-   ##
==========================================
+ Coverage   82.15%   82.22%   +0.07%     
==========================================
  Files         248      248              
  Lines       20080    20078       -2     
==========================================
+ Hits        16496    16509      +13     
+ Misses       2557     2543      -14     
+ Partials     1027     1026       -1     

Impacted Files	Coverage Δ
pkg/core/native/management.go	88.60% <100.00%> (ø)
pkg/core/native/native_neo.go	72.46% <100.00%> (+1.99%)	⬆️
pkg/core/native/policy.go	90.03% <100.00%> (+0.79%)	⬆️
pkg/rpc/client/wsclient.go	82.70% <0.00%> (+1.50%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9a99054...690b787. Read the comment docs.

[AnnaShaleva]

1. We also have setMaxNotValidBeforeDelta method for native Notary. Could you, please, fix it too?
2. Native Management's setMinimumDeploymentFee also has the same problem, but it is not fixed in C#. I think we may leave a comment about it in C# repo.

[fyrchik]

@AnnaShaleva (1) is fixed and setMinimumDeploymentFee was void from the start in the C# node.