Rewrite IE11 user agent

e.g.

 config

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 9
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
    }
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  if { [class match -- [IP::client_addr] eq testip_class] } {
    HTTP::header replace "User-Agent" "whatever"
  }
}
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm data-group internal testip_class
ltm data-group internal testip_class {
    records {
        192.168.206.0/24 { }
    }
    type ip
}

 trace

[root@ve11a:Active:In Sync] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 192.168.206.35(64425) <-> 172.28.24.10(80)
1398869916.2194 (0.0041)  C>S
---------------------------------------------------------------
GET / HTTP/1.1
Host: 172.28.24.10
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive

---------------------------------------------------------------

New TCP connection 2: 200.200.200.14(64425) <-> 200.200.200.101(80)
1398869916.3089 (0.0869)  C>S
---------------------------------------------------------------
GET / HTTP/1.1
Host: 172.28.24.10
User-Agent: whatever
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive

---------------------------------------------------------------