patch: remove forloop var pass by reference

[denopink]

Sucessful testVerifyEnviromentRegistrars with patch:

=== RUN   TestNewEnvironment
=== RUN   TestNewEnvironment/Verify_Multi_Registrar_Environment
--- PASS: TestNewEnvironment/Verify_Multi_Registrar_Environment (0.00s)
--- PASS: TestNewEnvironment (0.00s)
PASS
ok      github.com/xmidt-org/webpa-common/v2/service/consul     0.019s

Failure testVerifyEnviromentRegistrars with forloop bug:

panic:
assert: mock: The method has been called over 1 times.
        Either do one more Mock.On("Register").Return(...), or remove extra call.
        This call was unexpected:
                Register(*api.AgentServiceRegistration)
                0: &api.AgentServiceRegistration{Kind:"", ID:"api:deadbeef", Name:"deadbeef-api", Tags:[]string{"role=deadbeef, region=1"}, Port:443, Address:"deadbeef.com", SocketPath:"", TaggedAddresses:map[string]api.ServiceAddress(nil), EnableTagOverride:false, Meta:map[string]string(nil), Weights:(*api.AgentWeights)(nil), Check:(*api.AgentServiceCheck)(nil), Checks:api.AgentServiceChecks(nil), Proxy:(*api.AgentServiceConnectProxyConfig)(nil), Connect:(*api.AgentServiceConnect)(nil), Namespace:"", Partition:"", Locality:(*api.Locality)(nil)}
        at: [/Users/odc/Documents/GitHub/xmidt-org/webpa-common/service/consul/mocks_test.go:60 /Users/odc/go/pkg/mod/github.com/go-kit/kit@v0.13.0/sd/consul/registrar.go:30 /Users/odc/Documents/GitHub/xmidt-org/webpa-common/service/registrars.go:13 /Users/odc/Documents/GitHub/xmidt-org/webpa-common/service/environment.go:198 /Users/odc/Documents/GitHub/xmidt-org/webpa-common/service/consul/environment_test.go:191] [recovered]
        panic:
assert: mock: The method has been called over 1 times.
        Either do one more Mock.On("Register").Return(...), or remove extra call.
        This call was unexpected:
                Register(*api.AgentServiceRegistration)
                0: &api.AgentServiceRegistration{Kind:"", ID:"api:deadbeef", Name:"deadbeef-api", Tags:[]string{"role=deadbeef, region=1"}, Port:443, Address:"deadbeef.com", SocketPath:"", TaggedAddresses:map[string]api.ServiceAddress(nil), EnableTagOverride:false, Meta:map[string]string(nil), Weights:(*api.AgentWeights)(nil), Check:(*api.AgentServiceCheck)(nil), Checks:api.AgentServiceChecks(nil), Proxy:(*api.AgentServiceConnectProxyConfig)(nil), Connect:(*api.AgentServiceConnect)(nil), Namespace:"", Partition:"", Locality:(*api.Locality)(nil)}
        at: [/Users/odc/Documents/GitHub/xmidt-org/webpa-common/service/consul/mocks_test.go:60 /Users/odc/go/pkg/mod/github.com/go-kit/kit@v0.13.0/sd/consul/registrar.go:30 /Users/odc/Documents/GitHub/xmidt-org/webpa-common/service/registrars.go:13 /Users/odc/Documents/GitHub/xmidt-org/webpa-common/service/environment.go:198 /Users/odc/Documents/GitHub/xmidt-org/webpa-common/service/consul/environment_test.go:191]