[TUBEMQ-446]Small bugs fix that do not affect the main logics

[gosonzhang]

Found some small bugs

1. AddressUtils.getIPV4LocalAddress() should first check whether localIPAddress has been set, and use it directly under the premise that it has been set to reduce unnecessary get operations;
2. The fetchCount parameter in MessageConsumerExample may be negative, so the executorService object should not use fetchCount as the initial value.
3. Remove the useless parameter WITHOUTDELAY

[lamberliu]

LGTM

[codecov-io]

Codecov Report

Merging #346 (03d1cb0) into master (43d2e7b) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             master    #346      +/-   ##
===========================================
- Coverage      7.73%   7.73%   -0.01%     
  Complexity      464     464              
===========================================
  Files           258     258              
  Lines         27891   27892       +1     
  Branches       4579    4579              
===========================================
  Hits           2157    2157              
- Misses        25268   25269       +1     
  Partials        466     466              

Impacted Files	Coverage Δ	Complexity Δ
...org/apache/tubemq/corebase/utils/AddressUtils.java	10.71% <0.00%> (-0.16%)	5.00 <2.00> (ø)
...rg/apache/tubemq/server/tools/cli/CliConsumer.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
.../tubemq/corebase/policies/FlowCtrlRuleHandler.java	42.52% <0.00%> (ø)	34.00% <0.00%> (ø%)

---

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 43d2e7b...03d1cb0. Read the comment docs.