Description of problem:

rhq-installer.sh should suppress java trace caused by invalid arguments

[hudson@vnguyen4 bin]$ ./rhq-installer.sh --dd
Starting RHQ Server installer ...
16:35:02,304 INFO  [org.jboss.modules] JBoss Modules version 1.1.2.GA-redhat-1
16:35:02,387 INFO  [org.rhq.enterprise.server.installer.Installer] Starting installer...
installer: unrecognized option '--dd'
16:35:02,397 INFO  [org.rhq.enterprise.server.installer.Installer] RHQ Installer
	--help, -H: this help text
	-Dname=value: set system properties for the Installer VM
	--host=<hostname>, -h: hostname where the app server is running
	--port=<port>, -p: talk to the app server over this management port
	--test, -t: test the validity of the server properties (install not performed)
	--listservers, -l: show list of known installed servers (install not performed)
	--setupdb, -b: only perform database schema creation or update
	--reconfig, -r: resets some configuration settings in an installed server
	--dbpassword, -d: encodes a DB password for rhq-server.properties (install not performed)

16:35:02,398 ERROR [org.rhq.enterprise.server.installer.Installer] An error occurred: java.lang.IllegalArgumentException
	at org.rhq.enterprise.server.installer.Installer.processArguments(Installer.java:194) [rhq-installer-util-4.6.0.JON.jar:4.6.0.JON]
	at org.rhq.enterprise.server.installer.Installer.doInstall(Installer.java:76) [rhq-installer-util-4.6.0.JON.jar:4.6.0.JON]
	at org.rhq.enterprise.server.installer.Installer.main(Installer.java:57) [rhq-installer-util-4.6.0.JON.jar:4.6.0.JON]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_24]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.6.0_24]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.6.0_24]
	at java.lang.reflect.Method.invoke(Method.java:616) [rt.jar:1.6.0_24]
	at org.jboss.modules.Module.run(Module.java:270)
	at org.jboss.modules.Main.main(Main.java:294)


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