refactor(core): move module not found log message to trace

- We have many attributes without modules, there is no reason
  to log that we don't have a module for them.
- Fixed typos in exception messages when retrieving modules.

perun-core/src/main/java/cz/metacentrum/perun/core/impl/AttributesManagerImpl.java

@@ -4340,7 +4340,7 @@ private GroupAttributesModuleImplApi getGroupAttributeModule(PerunSession sess,
 		if (attributeModule instanceof GroupAttributesModuleImplApi) {
 			return (GroupAttributesModuleImplApi) attributeModule;
 		} else {
-			throw new WrongModuleTypeException("Required attribute module isn't FacilityAttributesModule");
+			throw new WrongModuleTypeException("Required attribute module isn't GroupAttributesModule");
 		}
 	}
 
@@ -4376,7 +4376,7 @@ private VoAttributesModuleImplApi getVoAttributeModule(PerunSession sess, Attrib
 		if (attributeModule instanceof VoAttributesModuleImplApi) {
 			return (VoAttributesModuleImplApi) attributeModule;
 		} else {
-			throw new WrongModuleTypeException("Required attribute module isn't FacilityAttributesModule");
+			throw new WrongModuleTypeException("Required attribute module isn't VoAttributesModule");
 		}
 	}
 
@@ -4394,7 +4394,7 @@ private MemberResourceAttributesModuleImplApi getResourceMemberAttributeModule(P
 		if (attributeModule instanceof MemberResourceAttributesModuleImplApi) {
 			return (MemberResourceAttributesModuleImplApi) attributeModule;
 		} else {
-			throw new WrongModuleTypeException("Required attribute module isn't FacilityAttributesModule");
+			throw new WrongModuleTypeException("Required attribute module isn't ResourceMemberAttributesModule");
 		}
 	}
 
@@ -4691,7 +4691,7 @@ MemberGroupVirtualAttributesModuleImplApi getMemberGroupVirtualAttributeModule(P
 	 * Get UserExtSource attribute module for the attribute.
 	 *
 	 * @param attribute attribute for which you get the module
-	 * @return instance UserExtSource attribute module, null if the module doesn't exists
+	 * @return instance UserExtSource attribute module, null if the module doesn't exist
 	 */
 	private UserExtSourceVirtualAttributesModuleImplApi getUserExtSourceVirtualAttributeModule(PerunSession sess, AttributeDefinition attribute) {
 		Object attributeModule = getAttributesModule(sess, attribute);
@@ -4747,7 +4747,7 @@ public Object getAttributesModule(PerunSession sess, AttributeDefinition attribu
 		//if specific module not exists or attribute has no parameter, find the common one
 		moduleName = attributeNameToModuleName(attribute.getNamespace() + ":" + attribute.getBaseFriendlyName());
 		Object attributeModule = attributesModulesMap.get(moduleName);
-		if (attributeModule == null) log.debug("Attribute module not found. Module name={}", moduleName);
+		if (attributeModule == null) log.trace("Attribute module not found. Module name={}", moduleName);
 		return attributeModule;
 	}