User Cache is per Scope and not per ckan installation. Fixed this issue

src/main/java/org/gcube/gcat/persistence/ckan/CKANUserCache.java

@@ -22,7 +22,7 @@ public abstract class CKANUserCache {
 	
 	private static final MutableConfiguration<String,CKANUser> userCacheConfiguration;
 	
-	private static final Map<String,Cache<String,CKANUser>> userCachePerCkanInstance;
+	private static final Map<String,Cache<String,CKANUser>> userCachePerContext;
 	
 	static {
 		CachingProvider provider = Caching.getCachingProvider();
@@ -32,18 +32,18 @@ public abstract class CKANUserCache {
 				.setStoreByValue(false)
 				.setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(new Duration(TimeUnit.MINUTES, 15)));
 		
-		userCachePerCkanInstance = new HashMap<String,Cache<String,CKANUser>>();
+		userCachePerContext = new HashMap<String,Cache<String,CKANUser>>();
 	}
 	
 	private CKANUserCache() {
 	}
 	
 	public static CKANUser getCurrrentCKANUser() {
-		String ckanURL = CKANInstance.getInstance().getCKANURL();
-		Cache<String,CKANUser> userCache = userCachePerCkanInstance.get(ckanURL);
+		String context = ContextUtility.getCurrentContext();
+		Cache<String,CKANUser> userCache = userCachePerContext.get(context);
 		if(userCache == null) {
 			userCache = cacheManager.createCache(USERS_CACHE, userCacheConfiguration);
-			userCachePerCkanInstance.put(ckanURL, userCache);
+			userCachePerContext.put(context, userCache);
 		}
 		
 		String gcubeUsername = ContextUtility.getUsername();