Avoid unresolved bean issue when retrieving the ShutdownReadinessCheck

[cescoffier]

Fixes: #7631

Without, you get:

Mar 06, 2020 10:46:58 AM io.quarkus.runtime.shutdown.ShutdownRecorder runShutdown
ERROR: Graceful shutdown failed
javax.enterprise.inject.UnsatisfiedResolutionException: No bean found for required type [class io.quarkus.smallrye.health.runtime.ShutdownReadinessCheck] and qualifiers [[@org.eclipse.microprofile.health.Readiness()]]
	at io.quarkus.arc.impl.InstanceImpl.bean(InstanceImpl.java:151)
	at io.quarkus.arc.impl.InstanceImpl.get(InstanceImpl.java:81)
	at io.quarkus.smallrye.health.runtime.ShutdownReadinessListener.preShutdown(ShutdownReadinessListener.java:24)
	at io.quarkus.runtime.shutdown.ShutdownRecorder.runShutdown(ShutdownRecorder.java:30)
	at io.quarkus.runtime.Application.stop(Application.java:171)
	at io.quarkus.runtime.Application.close(Application.java:114)
	at io.quarkus.runner.bootstrap.StartupActionImpl$1.close(StartupActionImpl.java:107)
	at io.quarkus.runner.bootstrap.RunningQuarkusApplicationImpl.close(RunningQuarkusApplicationImpl.java:29)
	at io.quarkus.test.junit.QuarkusTestExtension$1.close(QuarkusTestExtension.java:101)
	at io.quarkus.test.junit.QuarkusTestExtension$ExtensionState.close(QuarkusTestExtension.java:372)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.jupiter.engine.execution.ExtensionValuesStore.closeAllStoredCloseableValues(ExtensionValuesStore.java:61)
	at org.junit.jupiter.engine.descriptor.AbstractExtensionContext.close(AbstractExtensionContext.java:73)
	at org.junit.jupiter.engine.execution.JupiterEngineExecutionContext.close(JupiterEngineExecutionContext.java:53)
	at org.junit.jupiter.engine.descriptor.JupiterEngineDescriptor.cleanUp(JupiterEngineDescriptor.java:67)
	at org.junit.jupiter.engine.descriptor.JupiterEngineDescriptor.cleanUp(JupiterEngineDescriptor.java:29)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$cleanUp$9(NodeTestTask.java:151)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.cleanUp(NodeTestTask.java:151)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:83)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248)
	at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211)
	at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132)
	at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)