The Service Registry fails Kafka authentication if the SCRAM password contains a "@"

Issue

• The Service Registry fails Kafka authentication if the SCRAM password contains a "@" with the following exception:

      2020-09-08 14:24:42,813 ERROR [io.qua.application] (main) Failed to start application: org.apache.kafka.common.KafkaException: Failed to create new KafkaAdminClient
                  at org.apache.kafka.clients.admin.KafkaAdminClient.createInternal(KafkaAdminClient.java:451)
                  at org.apache.kafka.clients.admin.Admin.create(Admin.java:69)
                  at org.apache.kafka.streams.processor.internals.DefaultKafkaClientSupplier.getAdmin(DefaultKafkaClientSupplier.java:41)
                  at org.apache.kafka.streams.KafkaStreams.<init>(KafkaStreams.java:737)
                  at org.apache.kafka.streams.KafkaStreams.<init>(KafkaStreams.java:647)
                  at org.apache.kafka.streams.KafkaStreams.<init>(KafkaStreams.java:557)
                  at io.apicurio.registry.streams.StreamsRegistryConfiguration.storageStreams(StreamsRegistryConfiguration.java:98)
                  at io.apicurio.registry.streams.StreamsRegistryConfiguration_ProducerMethod_storageStreams_f2537b9bcd15d7b768fa2bd48bdd1fdfe11117c1_Bean.create(StreamsRegistryConfiguration_ProducerMethod_storageStreams_f2537b9bcd15d7b768fa2bd48bdd1fdfe11117c1_Bean.zig:325)
                  at io.apicurio.registry.streams.StreamsRegistryConfiguration_ProducerMethod_storageStreams_f2537b9bcd15d7b768fa2bd48bdd1fdfe11117c1_Bean.create(StreamsRegistryConfiguration_ProducerMethod_storageStreams_f2537b9bcd15d7b768fa2bd48bdd1fdfe11117c1_Bean.zig:78)
                  at io.quarkus.arc.impl.AbstractSharedContext.createInstanceHandle(AbstractSharedContext.java:80)
                  at io.quarkus.arc.impl.ComputingCache$CacheFunction.lambda$apply$0(ComputingCache.java:99)
                  at io.quarkus.arc.impl.LazyValue.get(LazyValue.java:26)
                  at io.quarkus.arc.impl.ComputingCache.getValue(ComputingCache.java:41)
                  at io.quarkus.arc.impl.AbstractSharedContext.get(AbstractSharedContext.java:25)
                  at io.apicurio.registry.streams.StreamsRegistryConfiguration_ProducerMethod_storageStreams_f2537b9bcd15d7b768fa2bd48bdd1fdfe11117c1_Bean.get(StreamsRegistryConfiguration_ProducerMethod_storageStreams_f2537b9bcd15d7b768fa2bd48bdd1fdfe11117c1_Bean.zig:225)
                  at io.apicurio.registry.streams.StreamsRegistryConfiguration_ProducerMethod_storageStreams_f2537b9bcd15d7b768fa2bd48bdd1fdfe11117c1_Bean.get(StreamsRegistryConfiguration_ProducerMethod_storageStreams_f2537b9bcd15d7b768fa2bd48bdd1fdfe11117c1_Bean.zig:93)
                  at io.apicurio.registry.streams.StreamsRegistryConfiguration_Observer_init_c449f8498a775a6043659cf6f47a7bd5492d1695.notify(StreamsRegistryConfiguration_Observer_init_c449f8498a775a6043659cf6f47a7bd5492d1695.zig:107)
                  at io.quarkus.arc.impl.EventImpl$Notifier.notifyObservers(EventImpl.java:282)
                  at io.quarkus.arc.impl.EventImpl$Notifier.notify(EventImpl.java:267)
                  at io.quarkus.arc.impl.EventImpl.fire(EventImpl.java:69)
                  at io.quarkus.arc.runtime.LifecycleEventRunner.fireStartupEvent(LifecycleEventRunner.java:23)
                  at io.quarkus.arc.runtime.ArcRecorder.handleLifecycleEvents(ArcRecorder.java:113)
                  at io.quarkus.deployment.steps.LifecycleEventsBuildStep$startupEvent43.deploy_0(LifecycleEventsBuildStep$startupEvent43.zig:77)
                  at io.quarkus.deployment.steps.LifecycleEventsBuildStep$startupEvent43.deploy(LifecycleEventsBuildStep$startupEvent43.zig:36)
                  at io.quarkus.runner.ApplicationImpl.doStart(ApplicationImpl.zig:210)
                  at io.quarkus.runtime.Application.start(Application.java:90)
                  at io.quarkus.runtime.Application.run(Application.java:228)
                  at io.quarkus.runner.GeneratedMain.main(GeneratedMain.zig:41)
      Caused by: java.lang.IllegalArgumentException: Value not specified for key 'null' in JAAS config
                  at org.apache.kafka.common.security.JaasConfig.parseAppConfigurationEntry(JaasConfig.java:116)
                  at org.apache.kafka.common.security.JaasConfig.<init>(JaasConfig.java:63)
                  at org.apache.kafka.common.security.JaasContext.load(JaasContext.java:90)
                  at org.apache.kafka.common.security.JaasContext.loadClientContext(JaasContext.java:84)
                  at org.apache.kafka.common.network.ChannelBuilders.create(ChannelBuilders.java:124)
                  at org.apache.kafka.common.network.ChannelBuilders.clientChannelBuilder(ChannelBuilders.java:67)
                  at org.apache.kafka.clients.ClientUtils.createChannelBuilder(ClientUtils.java:99)
                  at org.apache.kafka.clients.admin.KafkaAdminClient.createInternal(KafkaAdminClient.java:426)
                  ... 27 more