fix: consumer should wait registry ready

[codecov-io]

Codecov Report

Merging #10 into master will decrease coverage by 42.54%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           master      #10       +/-   ##
===========================================
- Coverage   98.91%   56.37%   -42.55%     
===========================================
  Files          30       30               
  Lines        1294     1295        +1     
===========================================
- Hits         1280      730      -550     
- Misses         14      565      +551

Impacted Files	Coverage Δ
lib/client/consumer.js	78.87% <100%> (-21.13%)	:arrow_down:
lib/test/index.js	3.35% <0%> (-96.65%)	:arrow_down:
lib/client/loadbalancer/consistent_hash.js	13.33% <0%> (-86.67%)	:arrow_down:
lib/client/loadbalancer/random.js	14.28% <0%> (-85.72%)	:arrow_down:
lib/client/loadbalancer/weight_rr.js	29.41% <0%> (-70.59%)	:arrow_down:
lib/client/metric/health_counts.js	33.33% <0%> (-66.67%)	:arrow_down:
lib/client/address_group.js	40.45% <0%> (-56.82%)	:arrow_down:
lib/client/circuit_breaker.js	47.69% <0%> (-52.31%)	:arrow_down:
lib/registry/zk/data_client.js	44.87% <0%> (-47.44%)	:arrow_down:
lib/registry/base.js	62.5% <0%> (-37.5%)	:arrow_down:
... and 14 more

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[gxcsoccer]

1.1.1