Remove ex.printStackTrace() in tests

Closes gh-13952

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/livereload/LiveReloadServerTests.java

@@ -188,7 +188,6 @@ public class LiveReloadServerTests {
 					super.run();
 				}
 				catch (ConnectionClosedException ex) {
-					ex.printStackTrace();
 					synchronized (MonitoredLiveReloadServer.this.monitor) {
 						MonitoredLiveReloadServer.this.closedExceptions.add(ex);
 					}

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/tunnel/server/SocketTargetServerConnectionTests.java

@@ -162,7 +162,6 @@ public class SocketTargetServerConnectionTests {
 					channel.close();
 				}
 				catch (Exception ex) {
-					ex.printStackTrace();
 					fail();
 				}
 			}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/CollectionBinderTests.java

@@ -124,7 +124,6 @@ public class CollectionBinderTests {
 			fail("No exception thrown");
 		}
 		catch (BindException ex) {
-			ex.printStackTrace();
 			Set<ConfigurationProperty> unbound = ((UnboundConfigurationPropertiesException) ex
 					.getCause()).getUnboundProperties();
 			assertThat(unbound).hasSize(1);
@@ -147,7 +146,6 @@ public class CollectionBinderTests {
 			fail("No exception thrown");
 		}
 		catch (BindException ex) {
-			ex.printStackTrace();
 			Set<ConfigurationProperty> unbound = ((UnboundConfigurationPropertiesException) ex
 					.getCause()).getUnboundProperties();
 			assertThat(unbound).hasSize(1);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/BeanCurrentlyInCreationFailureAnalyzerTests.java

@@ -144,7 +144,6 @@ public class BeanCurrentlyInCreationFailureAnalyzerTests {
 			return null;
 		}
 		catch (Exception ex) {
-			ex.printStackTrace();
 			return ex;
 		}
 	}