Remove dependency management for Spring Shell

While the benign exception that Gemfire outputs is unfortunate, it
isn't sufficient justification for adding dependency management for
Spring Shell.

Closes gh-5444

spring-boot-dependencies/pom.xml

@@ -151,7 +151,6 @@
 		<spring-security-jwt.version>1.0.4.RELEASE</spring-security-jwt.version>
 		<spring-security-oauth.version>2.0.9.RELEASE</spring-security-oauth.version>
 		<spring-session.version>1.2.0.RC1</spring-session.version>
-		<spring-shell.version>1.1.0.RELEASE</spring-shell.version>
 		<spring-social.version>1.1.4.RELEASE</spring-social.version>
 		<spring-social-facebook.version>2.0.3.RELEASE</spring-social-facebook.version>
 		<spring-social-linkedin.version>1.0.2.RELEASE</spring-social-linkedin.version>
@@ -2042,11 +2041,6 @@
 				<artifactId>spring-session-data-redis</artifactId>
 				<version>${spring-session.version}</version>
 			</dependency>
-			<dependency>
-				<groupId>org.springframework.shell</groupId>
-				<artifactId>spring-shell</artifactId>
-				<version>${spring-shell.version}</version>
-			</dependency>
 			<dependency>
 				<groupId>org.springframework.social</groupId>
 				<artifactId>spring-social-config</artifactId>

spring-boot-samples/spring-boot-sample-data-gemfire/pom.xml

@@ -23,19 +23,11 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-data-gemfire</artifactId>
 		</dependency>
-
-		<dependency>
-			<groupId>org.springframework.shell</groupId>
-			<artifactId>spring-shell</artifactId>
-			<scope>runtime</scope>
-		</dependency>
-
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-configuration-processor</artifactId>
 			<optional>true</optional>
 		</dependency>
-
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>