Disconnect delay configurable

[nocvalight]

Motivation:

Explain the context, and why you're making that change.
To make others understand what is the problem you're trying to solve.

Modification:

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Result:

Fixes #<118>.

#118

[codecov-commenter]

Codecov Report

Merging #141 into master will decrease coverage by 0.38%.
The diff coverage is 20.00%.

@@             Coverage Diff              @@
##             master     #141      +/-   ##
============================================
- Coverage     62.61%   62.22%   -0.39%     
  Complexity       44       44              
============================================
  Files           429      429              
  Lines         15502    15507       +5     
  Branches       1490     1490              
============================================
- Hits           9706     9649      -57     
- Misses         4783     4844      +61     
- Partials       1013     1014       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../sessionserver/SessionServerConnectionFactory.java	57.62% <0.00%> (-1.00%)	0.00 <0.00> (ø)
...gistry/server/data/bootstrap/DataServerConfig.java	59.52% <25.00%> (-0.85%)	0.00 <0.00> (ø)
...r/session/scheduler/SessionThreadPoolExecutor.java	66.66% <0.00%> (-33.34%)	0.00% <0.00%> (ø%)
...try/jraft/handler/RaftServerConnectionHandler.java	40.00% <0.00%> (-20.00%)	0.00% <0.00%> (ø%)
...registry/remoting/bolt/ConnectionEventAdapter.java	51.72% <0.00%> (-17.25%)	0.00% <0.00%> (ø%)
...sofa/registry/server/data/change/SnapshotData.java	90.00% <0.00%> (-10.00%)	0.00% <0.00%> (ø%)
...egistry/server/meta/store/SessionStoreService.java	56.59% <0.00%> (-9.35%)	0.00% <0.00%> (ø%)
...istry/server/meta/registry/MetaServerRegistry.java	66.66% <0.00%> (-9.10%)	0.00% <0.00%> (ø%)
...ipay/sofa/registry/server/data/util/DelayItem.java	52.17% <0.00%> (-8.70%)	0.00% <0.00%> (ø%)
...y/sofa/registry/server/data/change/ChangeData.java	58.33% <0.00%> (-8.34%)	0.00% <0.00%> (ø%)
... and 9 more

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[dzdx]

LGTM