Wait for circuit breaker to sync

[mauricioabreu]

We are checking before it is opening/closing,
making out tests fail randomly.

[mauricioabreu]

Not sure why but it looks like we have some concurrency problem here. I am digging into hystrix's codebase to find the reason.

[mauricioabreu]

Before merging it, I would like to debug our code instead of hystrix.

[mauricioabreu]

I set a logger to check what hystrix is doing.

➜  reliable-request git:(master) ✗ go test -v -count=1 -run Test_It_closes_the_circuit_breaker_after_the_sleep_window ./...
=== RUN   Test_It_closes_the_circuit_breaker_after_the_sleep_window
hystrix-go: opening circuit %v[custom_cb]hystrix-go: allowing single test to possibly close circuit %v[custom_cb]hystrix-go: closing circuit %v[custom_cb]--- FAIL: Test_It_closes_the_circuit_breaker_after_the_sleep_window (3.50s)
    reliablereq_test.go:292: 
                Error Trace:    reliablereq_test.go:292
                Error:          Not equal: 
                                expected: true
                                actual  : false
                Test:           Test_It_closes_the_circuit_breaker_after_the_sleep_window
FAIL
FAIL    github.com/globocom/reliable-request/reliablereq        3.515s