Fix reconnect of bolt/rest/h2c.

[ujjboy]

Modification:

• Remove dead connection from manager before reconnect.
• Fix reconnect behaviour of h2c and rest.

PS: Because of bolt-1.4.2 don't release IOEventGroup when stop(), so I can't write unit test case.

Result:

Fixes #178

[codecov-io]

Codecov Report

Merging #180 into master will increase coverage by 0.34%.
The diff coverage is 75%.

@@             Coverage Diff              @@
##             master     #180      +/-   ##
============================================
+ Coverage     68.58%   68.92%   +0.34%     
- Complexity      947      952       +5     
============================================
  Files           340      341       +1     
  Lines         14163    14183      +20     
  Branches       2274     2276       +2     
============================================
+ Hits           9714     9776      +62     
+ Misses         3287     3243      -44     
- Partials       1162     1164       +2

Impacted Files	Coverage Δ	Complexity Δ
...pay/sofa/rpc/server/rest/SofaNettyJaxrsServer.java	55.23% <100%> (+0.43%)	0 <0> (ø)	⬇️
...alipay/sofa/rpc/server/http/HttpServerHandler.java	70% <100%> (ø)	11 <1> (+1)	⬆️
...va/com/alipay/sofa/rpc/server/rest/RestServer.java	63.72% <100%> (ø)	0 <0> (ø)	⬇️
.../main/java/com/alipay/sofa/rpc/test/TestUtils.java	58.33% <58.33%> (ø)	0 <0> (?)
...c/transport/http/AbstractHttp2ClientTransport.java	78.04% <66.66%> (-0.22%)	29 <1> (+2)
...lipay/sofa/rpc/server/http/AbstractHttpServer.java	71.02% <85.71%> (+1.12%)	15 <0> (ø)	⬇️
.../main/java/com/alipay/sofa/rpc/tracer/Tracers.java	39.74% <0%> (-2.57%)	0% <0%> (ø)
...va/com/alipay/sofa/rpc/server/bolt/BoltServer.java	73.86% <0%> (-1.14%)	23% <0%> (-1%)
... and 10 more

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