### Description of problem:

When configuring the following RewriteValve setting using 'CO' flag:

~~~
<subsystem xmlns="urn:jboss:domain:web:2.1" default-virtual-server="default-host" native="false">
    <connector name="http" protocol="HTTP/1.1" scheme="http" socket-binding="http"/>
    <virtual-server name="default-host" enable-welcome-root="true">
        <alias name="localhost"/>
        <alias name="example.com"/>
        <rewrite name="rule-1" pattern="^/(.*)$" substitution="-" flags="CO=foo:bar:.example.com:60:/test">
            <condition name="condition-0" test="%{REQUEST_URI}" pattern=".*/valvetest/.*"/>
        </rewrite>
    </virtual-server>
</subsystem>
~~~

JBossWeb RewriteValve throws the following IllegalArgumentException at JBoss EAP start-up:

~~~
ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC000001: Failed to start service jboss.web.host.default-host: org.jboss.msc.service.StartException in service jboss.web.host.default-host: java.lang.IllegalArgumentException: JBWEB007005: Error reading rewrite flags in line RewriteRule ^/(.*)$ - [CO=foo:bar:.example.com:100:/test] as CO=foo:bar:.example.com:100:/test
	at org.jboss.as.web.WebVirtualHostService.createRewriteValve(WebVirtualHostService.java:225)
	at org.jboss.as.web.WebVirtualHostService.start(WebVirtualHostService.java:88)
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1980) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1913) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_67]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_67]
	at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_67]
Caused by: java.lang.IllegalArgumentException: JBWEB007005: Error reading rewrite flags in line RewriteRule ^/(.*)$ - [CO=foo:bar:.example.com:100:/test] as CO=foo:bar:.example.com:100:/test
	at org.jboss.web.rewrite.RewriteValve.parseRuleFlag(RewriteValve.java:718)
	at org.jboss.web.rewrite.RewriteValve.parse(RewriteValve.java:565)
	at org.jboss.web.rewrite.RewriteValve.parse(RewriteValve.java:208)
	at org.jboss.web.rewrite.RewriteValve.setConfiguration(RewriteValve.java:184)
	at org.jboss.as.web.WebVirtualHostService.createRewriteValve(WebVirtualHostService.java:223)
	... 6 more
~~~


### How reproducible:

Anytime when configuring the RewriteValve using 'CO' flag.


### Steps to Reproduce:
1. Configure the above <rewrite> config inside web subsystem in standalone.xml
2. Start EAP 6

### Actual results:

JBossWeb RewriteValve throws IllegalArgumentException at JBoss EAP start-up.


### Expected results:

JBoss EAP starts wihtout IllegalArgumentException and the configured RewriteValve works.


### Additional info:

http://docs.jboss.org/jbossweb/7.0.x/rewrite.html says:

~~~
'cookie|CO=NAME:VAL:domain[:lifetime[:path]]' (set cookie)
This sets a cookie in the client's browser. The cookie's name is specified by NAME and the value is VAL. The domain field is the domain of the cookie, such as '.apache.org', the optional lifetime is the lifetime of the cookie in minutes, and the optional path is the path of the cookie
~~~

so 'CO' flag should work.