Fix ConcurrentModificationException during app startup

[pmd1nh]

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[LibbyBot]

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• 1 product code files were changed.
• Please describe in a separate comment how you tested your changes.

[pmd1nh]

#build

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The build pmd1nh-2175-20180213-2045
https://wasrtc.hursley.ibm.com:9443/jazz/resource/itemOid/com.ibm.team.build.BuildResult/_h-mMwBDnEeiStsw2He7iFw
completed and has errors or failures.

[ewhoch]

This is causing a hard failure in the JDBC FAT since the change to concurrent hashmap doesn't allow null values, so this needs to come out:

java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1022)
	at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1017)
	at com.ibm.ws.webcontainer.webapp.WebAppConfiguration.addServletInfo(WebAppConfiguration.java:245)
	at com.ibm.ws.webcontainer.osgi.container.config.WebAppConfiguratorHelper$ConfigurationWriter.addServletInfo(WebAppConfiguratorHelper.java:387)
	at com.ibm.ws.webcontainer.osgi.container.config.WebAppConfiguratorHelper.processServletConfig(WebAppConfiguratorHelper.java:3001)
	at com.ibm.ws.webcontainer.osgi.container.config.WebAppConfiguratorHelper.configureServlets(WebAppConfiguratorHelper.java:2347)
	at com.ibm.ws.webcontainer.osgi.container.config.WebAppConfiguratorHelper.configureFromWebApp(WebAppConfiguratorHelper.java:748)
	at com.ibm.ws.webcontainer.osgi.container.config.WebAppConfigurator.configure(WebAppConfigurator.java:402)
	at com.ibm.ws.webcontainer.osgi.container.config.WebAppConfigurationAdapter.adapt(WebAppConfigurationAdapter.java:119)
	at com.ibm.ws.webcontainer.osgi.container.config.WebAppConfigurationAdapter.adapt(WebAppConfigurationAdapter.java:43)
	at com.ibm.ws.adaptable.module.internal.AdapterFactoryServiceImpl.adapt(AdapterFactoryServiceImpl.java:193)
	at com.ibm.ws.adaptable.module.internal.AdaptableContainerImpl.adapt(AdaptableContainerImpl.java:170)
	at com.ibm.ws.webcontainer.osgi.WebContainer.createModuleMetaData(WebContainer.java:833)
	at com.ibm.ws.app.manager.module.internal.ModuleHandlerBase.createModuleMetaData(ModuleHandlerBase.java:63)
	at com.ibm.ws.app.manager.module.internal.SimpleDeployedAppInfoBase$ModuleContainerInfoBase.createModuleMetaData(SimpleDeployedAppInfoBase.java:168)
	at com.ibm.ws.app.manager.module.internal.DeployedAppInfoBase.preDeployApp(DeployedAppInfoBase.java:368)
	at com.ibm.ws.app.manager.module.internal.DeployedAppInfoBase.deployApp(DeployedAppInfoBase.java:412)
	at com.ibm.ws.app.manager.war.internal.WARApplicationHandlerImpl.install(WARApplicationHandlerImpl.java:65)
	at com.ibm.ws.app.manager.internal.statemachine.StartAction.execute(StartAction.java:140)
	at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.enterState(ApplicationStateMachineImpl.java:1258)
	at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.run(ApplicationStateMachineImpl.java:873)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1153)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.lang.Thread.run(Thread.java:785)

[ewhoch]

this was for #1952