A few tweaks that might improve performance on startup

... or couldn't hurt anyway.

1. Extends the definition of a web application for @ConditionalOnWebapp
so that a StandardEnvironment can be used (cutting out JNDI failures
for Environment properties)

2. Doesn't bother using StandardServletEnvironment in integration tests

3. Make the NON_ENUMERABLE_ENUMERABLES in PropertySourcesPropertyValues
static so they only get initialized once (not a huge issue at all)

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnWebApplicationCondition.java

@@ -74,6 +74,11 @@ class OnWebApplicationCondition extends SpringBootCondition {
 					.match("found web application StandardServletEnvironment");
 		}
 
+		if (context.getResourceLoader() instanceof WebApplicationContext) {
+			return ConditionOutcome
+					.match("found web application WebApplicationContext");
+		}
+
 		return ConditionOutcome.noMatch("not a web application");
 	}