Use API Client instead of a plain ZnClient

[gcotelli]

It provides caching and connection pooling

Fixes #47

[codecov]

Codecov Report

Merging #50 (5ae4ef8) into release-candidate (5d649ab) will not change coverage.
The diff coverage is 100.00%.

@@                Coverage Diff                 @@
##           release-candidate      #50   +/-   ##
==================================================
  Coverage              99.62%   99.62%           
==================================================
  Files                     53       53           
  Lines                   2960     2960           
==================================================
  Hits                    2949     2949           
  Misses                    11       11           

Impacted Files	Coverage Δ
...uminalServiceDiscoveryExampleLauncherTest.class.st	100.00% <100.00%> (ø)
...ry/ConsulAgentHttpAPIBasedDiscoveryClient.class.st	100.00% <100.00%> (ø)

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