Description of problem:
Creation of a thread pool fails with the error JBAS014746: unit may not be null, rolled-back=true.

Version-Release number of selected component (if applicable):
4.4.0.JON312GA

How reproducible:
Always

Steps to Reproduce:
1.  Install, configure, and start EAP 6 standalone server.
2.  Start JBoss ON system.
3.  Import EAP 6 standalone server into inventory.
4.  Configure EAP resource's connection properties.
5.  Create a new *thread pool* with the minimum set of required properties for the EAP resource:

    Navigate to *JBossAS7 Standalone Servers / EAP (127.0.0.1:9990)* and right-clicking on *thread > Create Child -> Thread Pool*:

        *New Resource Name*: `TestBoundedPool`
        *Resource Configuration Template*: `Bounded Queue Thread Pool`
        *Max Threads*: `10`


Actual results:
Thread pool creation fails with the error and report the following error on the child history page:

    JBAS014746: unit may not be null, rolled-back=true

Expected results:
Thread pool creation should be successful and the defaults should be applied for keepalive-time.

Additional info:
keepalive-time is defined as:

                        "keepalive-time" => {
                            "type" => OBJECT,
                            "description" => "Used to specify the amount of time that pool threads should be kept running when idle; if not specified, threads will run until the executor is shut down.",
                            "expressions-allowed" => false,
                            "nillable" => true,
                            "value-type" => {
                                "time" => {
                                    "type" => LONG,
                                    "description" => "The time",
                                    "expressions-allowed" => true,
                                    "nillable" => false
                                },
                                "unit" => {
                                    "type" => STRING,
                                    "description" => "The time unit",
                                    "expressions-allowed" => true,
                                    "nillable" => false
                                }
                            },
                            "access-type" => "read-write",
                            "storage" => "configuration",
                            "restart-required" => "no-services"
                        }

Because it is nillable, it is optional and therefore, not required:

/subsystem=threads/bounded-queue-thread-pool=MyThreadPool:add(max-threads=10,queue-length=100)
{"outcome" => "success"}