Add verboseSocketExceptions flag

[trustin]

Motivation:

Since we fixed the behavior of verboseExceptions flag with respect to
Exceptions.isExpected(), we received the report of increased
exceptions logged. However, most of them were harmless socket-related
ones such as connection reset by peer, where we do not have control
over, because network disconnection can always happen.

Modifications:

• Added a new flag verboseSocketException which defaults to false.
• Modified Exceptions.isExpected() to use verboseSocketException
  instead of verboseException.

Result:

• Less noisy log messages

[codecov]

Codecov Report

Merging #1577 into master will increase coverage by 0.08%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master    #1577      +/-   ##
============================================
+ Coverage     72.77%   72.85%   +0.08%     
- Complexity     7495     7518      +23     
============================================
  Files           695      695              
  Lines         30171    30190      +19     
  Branches       3683     3687       +4     
============================================
+ Hits          21956    21994      +38     
+ Misses         6310     6298      -12     
+ Partials       1905     1898       -7

Impacted Files	Coverage Δ	Complexity Δ
...a/com/linecorp/armeria/common/util/Exceptions.java	39.13% <0%> (+9.56%)	25 <11> (+11)	⬆️
...c/main/java/com/linecorp/armeria/common/Flags.java	65.26% <100%> (+0.36%)	47 <1> (+1)	⬆️
...rp/armeria/server/tomcat/ManagedTomcatService.java	50.84% <0%> (-11.87%)	6% <0%> (-1%)
...armeria/server/tomcat/Tomcat90ProtocolHandler.java	48.14% <0%> (-7.41%)	11% <0%> (-2%)
...spring/web/reactive/ArmeriaHttpHandlerAdapter.java	75% <0%> (-3.95%)	5% <0%> (ø)
...lient/circuitbreaker/CircuitBreakerHttpClient.java	69.69% <0%> (-3.04%)	10% <0%> (-1%)
.../linecorp/armeria/server/tomcat/TomcatService.java	63.82% <0%> (+0.09%)	24% <0%> (ø)	⬇️
.../armeria/internal/grpc/ArmeriaMessageDeframer.java	69.33% <0%> (+0.94%)	44% <0%> (+1%)	⬆️
...com/linecorp/armeria/server/HttpServerHandler.java	78.7% <0%> (+1.52%)	79% <0%> (+5%)	⬆️
...inecorp/armeria/client/grpc/ArmeriaClientCall.java	81.67% <0%> (+1.52%)	37% <0%> (+1%)	⬆️
... and 7 more

---

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[codecov]

Codecov Report

Merging #1577 into master will increase coverage by 0.08%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master    #1577      +/-   ##
============================================
+ Coverage     72.77%   72.85%   +0.08%     
- Complexity     7495     7518      +23     
============================================
  Files           695      695              
  Lines         30171    30190      +19     
  Branches       3683     3687       +4     
============================================
+ Hits          21956    21994      +38     
+ Misses         6310     6298      -12     
+ Partials       1905     1898       -7

Impacted Files	Coverage Δ	Complexity Δ
...a/com/linecorp/armeria/common/util/Exceptions.java	39.13% <0%> (+9.56%)	25 <11> (+11)	⬆️
...c/main/java/com/linecorp/armeria/common/Flags.java	65.26% <100%> (+0.36%)	47 <1> (+1)	⬆️
...rp/armeria/server/tomcat/ManagedTomcatService.java	50.84% <0%> (-11.87%)	6% <0%> (-1%)
...armeria/server/tomcat/Tomcat90ProtocolHandler.java	48.14% <0%> (-7.41%)	11% <0%> (-2%)
...spring/web/reactive/ArmeriaHttpHandlerAdapter.java	75% <0%> (-3.95%)	5% <0%> (ø)
...lient/circuitbreaker/CircuitBreakerHttpClient.java	69.69% <0%> (-3.04%)	10% <0%> (-1%)
.../linecorp/armeria/server/tomcat/TomcatService.java	63.82% <0%> (+0.09%)	24% <0%> (ø)	⬇️
.../armeria/internal/grpc/ArmeriaMessageDeframer.java	69.33% <0%> (+0.94%)	44% <0%> (+1%)	⬆️
...com/linecorp/armeria/server/HttpServerHandler.java	78.7% <0%> (+1.52%)	79% <0%> (+5%)	⬆️
...inecorp/armeria/client/grpc/ArmeriaClientCall.java	81.67% <0%> (+1.52%)	37% <0%> (+1%)	⬆️
... and 7 more

---

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 70f781f...11c90fa. Read the comment docs.