Clean up logging dependencies and exclusions

Closes spring-projectsgh-11148

Author: wilkinsona

Diff for: spring-boot-project/spring-boot-dependencies/pom.xml

@@ -272,12 +272,6 @@
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter</artifactId>
 				<version>${revision}</version>
-				<exclusions>
-					<exclusion>
-						<groupId>commons-logging</groupId>
-						<artifactId>commons-logging</artifactId>
-					</exclusion>
-				</exclusions>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
@@ -503,12 +497,6 @@
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-test</artifactId>
 				<version>${revision}</version>
-				<exclusions>
-					<exclusion>
-						<groupId>commons-logging</groupId>
-						<artifactId>commons-logging</artifactId>
-					</exclusion>
-				</exclusions>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>

Diff for: spring-boot-project/spring-boot-starters/spring-boot-starter-log4j2/pom.xml

@@ -19,10 +19,6 @@
 			<groupId>org.apache.logging.log4j</groupId>
 			<artifactId>log4j-slf4j-impl</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.apache.logging.log4j</groupId>
-			<artifactId>log4j-api</artifactId>
-		</dependency>
 		<dependency>
 			<groupId>org.apache.logging.log4j</groupId>
 			<artifactId>log4j-core</artifactId>

Diff for: spring-boot-project/spring-boot-starters/spring-boot-starter-logging/pom.xml

@@ -26,9 +26,5 @@
 			<groupId>org.slf4j</groupId>
 			<artifactId>jul-to-slf4j</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>log4j-over-slf4j</artifactId>
-		</dependency>
 	</dependencies>
 </project>

Diff for: spring-boot-project/spring-boot-starters/spring-boot-starter/pom.xml

@@ -33,12 +33,6 @@
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-core</artifactId>
-			<exclusions>
-				<exclusion>
-					<groupId>commons-logging</groupId>
-					<artifactId>commons-logging</artifactId>
-				</exclusion>
-			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.yaml</groupId>