MongoDB tests should be ignored when running unit tests by default

[ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 30.475 s <<< FAILURE! - in org.nuxeo.ecm.core.mongodb.kv.TestMongoDBKeyValueStore
[ERROR] org.nuxeo.ecm.core.mongodb.kv.TestMongoDBKeyValueStore  Time elapsed: 0.005 s  <<< FAILURE!
java.lang.AssertionError: invoke on features error [Holder [type=class org.nuxeo.runtime.test.runner.MDCFeature], Holder [type=class org.nuxeo.runtime.test.runner.ConditionalIgnoreRule$Feature], Holder [type=class org.nuxeo.runtime.test.runner.RandomBug$Feature], Holder [type=class org.nuxeo.runtime.test.runner.RuntimeFeature], Holder [type=class org.nuxeo.runtime.mongodb.MongoDBFeature], Holder [type=class org.nuxeo.runtime.test.runner.TransactionalFeature]]
	at org.nuxeo.runtime.test.runner.FeaturesLoader.apply(FeaturesLoader.java:123)
	at org.nuxeo.runtime.test.runner.FeaturesLoader.apply(FeaturesLoader.java:113)
	at org.nuxeo.runtime.test.runner.FeaturesRunner.start(FeaturesRunner.java:171)
	at org.nuxeo.runtime.test.runner.FeaturesRunner$BeforeClassStatement.evaluate(FeaturesRunner.java:214)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runners.Suite.runChild(Suite.java:128)
	at org.junit.runners.Suite.runChild(Suite.java:27)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.apache.maven.surefire.junitcore.JUnitCore.run(JUnitCore.java:55)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.createRequestAndRun(JUnitCoreWrapper.java:137)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.executeEager(JUnitCoreWrapper.java:107)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:83)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:75)
	at org.apache.maven.surefire.junitcore.JUnitCoreProvider.invoke(JUnitCoreProvider.java:158)
	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
	Suppressed: com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting to connect. Client view of cluster state is {type=UNKNOWN, servers=[{address=localhost:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketOpenException: Exception opening socket}, caused by {java.net.ConnectException: Connection refused (Connection refused)}}]
		at com.mongodb.internal.connection.BaseCluster.getDescription(BaseCluster.java:179)
		at com.mongodb.internal.connection.SingleServerCluster.getDescription(SingleServerCluster.java:41)
		at com.mongodb.client.internal.MongoClientDelegate.getConnectedClusterDescription(MongoClientDelegate.java:136)
		at com.mongodb.client.internal.MongoClientDelegate.createClientSession(MongoClientDelegate.java:94)
		at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.getClientSession(MongoClientDelegate.java:249)
		at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:190)
		at com.mongodb.client.internal.MongoDatabaseImpl.executeDrop(MongoDatabaseImpl.java:198)
		at com.mongodb.client.internal.MongoDatabaseImpl.drop(MongoDatabaseImpl.java:188)
		at org.nuxeo.runtime.mongodb.MongoDBFeature.start(MongoDBFeature.java:79)
		at org.nuxeo.runtime.test.runner.FeaturesRunner.lambda$start$5(FeaturesRunner.java:171)
		at org.nuxeo.runtime.test.runner.FeaturesLoader.apply(FeaturesLoader.java:126)
		... 23 more