Cleanups of build including upgrade of Brave (#1530)

In efforts to dig deep into benchmarks, I noticed we were a bit out of
date on Brave. Then, noticed some other artifacts could be bumped
safely. Finally, a find/replace on http/https was over zealous and
tripped up XML.

One change to test expectations and Brave is explained here:
https://github.com/openzipkin/brave/blob/master/instrumentation/RATIONALE.md#calling-spanfinish-while-the-context-is-in-scope

spring-cloud-sleuth-core/pom.xml

@@ -15,7 +15,7 @@
   ~ limitations under the License.
   -->
 
-<project xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		 xmlns="http://maven.apache.org/POM/4.0.0"
 		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
@@ -383,7 +383,6 @@
 			<build>
 				<plugins>
 					<plugin>
-						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-surefire-plugin</artifactId>
 						<configuration>
 							<forkCount>4</forkCount>

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/feign/TracingFeignClientTests.java

@@ -89,7 +89,7 @@ public class TracingFeignClientTests {
 		}
 
 		then(this.reporter.getSpans().get(0)).extracting("kind.ordinal")
-				.contains(Span.Kind.CLIENT.ordinal());
+				.isEqualTo(Span.Kind.CLIENT.ordinal());
 	}
 
 	@Test
@@ -113,7 +113,7 @@ public class TracingFeignClientTests {
 		}
 
 		then(this.reporter.getSpans().get(0)).extracting("kind.ordinal")
-				.contains(Span.Kind.CLIENT.ordinal());
+				.isEqualTo(Span.Kind.CLIENT.ordinal());
 		then(this.reporter.getSpans().get(0).tags()).containsEntry("error",
 				"exception has occurred");
 	}