Bug fix: ConsulRegistry keeps the first service url discovered in cache

[jsu216]

Fix the issue

[jsu216]

@stevehu I move the code change from CommandFailbackRegistry to ConsulRegistry to avoid any possible unexpected change to ZooKeeperRegistry.

[codecov-io]

Codecov Report

Merging #633 into 1.6.x will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##              1.6.x     #633      +/-   ##
============================================
- Coverage     50.42%   50.41%   -0.01%     
- Complexity     1912     1913       +1     
============================================
  Files           259      259              
  Lines         11564    11570       +6     
  Branches       1634     1634              
============================================
+ Hits           5831     5833       +2     
- Misses         5046     5051       +5     
+ Partials        687      686       -1

Impacted Files	Coverage Δ	Complexity Δ
...istry/support/command/CommandFailbackRegistry.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...main/java/com/networknt/consul/ConsulRegistry.java	51.23% <0%> (-1.98%)	21 <0> (ø)
.../src/main/java/com/networknt/utility/HashUtil.java	63.33% <0%> (+3.33%)	11% <0%> (+1%)	⬆️

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