Occasional failure in adminOP's tests

[wickyyang]

Failure in Spec Teardown (AfterEach) [19.277 seconds]
Tests AdminOP
/home/travis/gopath/src/github.com/dappledger/ann-tests/suites/admin/admin_test.go:123
With 4 validators [AfterEach]
/home/travis/gopath/src/github.com/dappledger/ann-tests/suites/admin/admin_test.go:126
test golang-sdk validator add/remove
/home/travis/gopath/src/github.com/dappledger/ann-tests/suites/admin/admin_test.go:131
Expected
: false
to be true
/home/travis/gopath/src/github.com/dappledger/ann-tests/suites/admin/admin_helper_test.go:367