Added missing conditionals

spring-cloud-sleuth-stream/src/main/java/org/springframework/cloud/sleuth/stream/SleuthStreamAutoConfiguration.java

@@ -71,6 +71,7 @@ public class SleuthStreamAutoConfiguration {
 	}
 
 	@Bean
+	@ConditionalOnMissingBean
 	public StreamSpanReporter sleuthStreamSpanReporter(HostLocator endpointLocator,
 			SpanMetricReporter spanMetricReporter) {
 		return new StreamSpanReporter(endpointLocator, spanMetricReporter);

spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin/ZipkinAutoConfiguration.java

@@ -51,7 +51,7 @@ import org.springframework.context.annotation.Configuration;
 public class ZipkinAutoConfiguration {
 
 	@Bean
-	@ConditionalOnMissingBean(ZipkinSpanReporter.class)
+	@ConditionalOnMissingBean
 	public ZipkinSpanReporter reporter(SpanMetricReporter spanMetricReporter, ZipkinProperties zipkin) {
 		return new HttpZipkinSpanReporter(zipkin.getBaseUrl(), zipkin.getFlushInterval(),
 				zipkin.getCompression().isEnabled(), spanMetricReporter);