Options to prevent starting consensus

[spikeekips]

Background

This PR is for testing usage

The new option, --stop-consensus prevents starting consensus(especially InitRound()), so SEBAK does not do anything, only waits for a client's requests.

The main usage of this option is for,

• When you download SEBAK db and you want to test it without modifying the original db.
• When you want to test the other features without regarding consensus.

At this time, I have been used this option for getting statistics data from mainnet dumped db.

[codecov-io]

Codecov Report

Merging #928 into master will decrease coverage by 0.19%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #928     +/-   ##
=========================================
- Coverage   61.01%   60.81%   -0.2%     
=========================================
  Files         159      159             
  Lines       11239    11244      +5     
=========================================
- Hits         6857     6838     -19     
- Misses       3575     3605     +30     
+ Partials      807      801      -6

Flag	Coverage Δ
#integration_tests_long_term	44% <100%> (+0.24%)	:arrow_up:
#integration_tests_node	40.42% <100%> (-0.65%)	:arrow_down:
#integration_tests_retry	37.75% <100%> (-0.02%)	:arrow_down:
#unittests	47.4% <66.66%> (ø)	:arrow_up:

Impacted Files	Coverage Δ
cmd/sebak/cmd/run.go	56.99% <100%> (+0.29%)	:arrow_up:
lib/node/runner/node_runner.go	78.21% <100%> (+0.04%)	:arrow_up:
lib/network/http2_client.go	56.7% <0%> (-10.31%)	:arrow_down:
lib/node/runner/node_api/api_node_item.go	53.84% <0%> (-10.26%)	:arrow_down:
lib/block/transaction_pool.go	52.83% <0%> (-3.78%)	:arrow_down:
lib/node/runner/util.go	71.42% <0%> (-3.58%)	:arrow_down:
lib/node/runner/finish_ballot.go	43.86% <0%> (-1.42%)	:arrow_down:
lib/node/runner/checker.go	73.4% <0%> (-0.22%)	:arrow_down:

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