Add missing classpath checks

Certain cache manager implementations are located in the
spring-context-support module that isn't pulled automatically.

As a result, the related cache auto-configurations should make sure that
the relevant CacheManager implementation is available.

See gh-2633

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/GuavaCacheConfiguration.java

@@ -40,7 +40,7 @@ import com.google.common.cache.CacheLoader;
  * @since 1.3.0
  */
 @Configuration
-@ConditionalOnClass(CacheBuilder.class)
+@ConditionalOnClass({CacheBuilder.class,GuavaCacheManager.class})
 @ConditionalOnMissingBean(CacheManager.class)
 @Conditional(CacheCondition.class)
 class GuavaCacheConfiguration {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/JCacheCacheConfiguration.java

@@ -18,7 +18,6 @@ package org.springframework.boot.autoconfigure.cache;
 
 import java.util.Iterator;
 import java.util.List;
-
 import javax.cache.CacheManager;
 import javax.cache.Caching;
 import javax.cache.configuration.MutableConfiguration;
@@ -49,7 +48,7 @@ import org.springframework.util.StringUtils;
  * @since 1.3.0
  */
 @Configuration
-@ConditionalOnClass(Caching.class)
+@ConditionalOnClass({Caching.class, JCacheCacheManager.class})
 @ConditionalOnMissingBean(org.springframework.cache.CacheManager.class)
 @Conditional({ CacheCondition.class,
 		JCacheCacheConfiguration.JCacheAvailableCondition.class })