Description of problem:
The restart operation for the AS5 plug-in does not fail when a failure occurs for the shutdown or start portion of the command.

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

How reproducible:
Always

Steps to Reproduce:
1.  Install, configure, and start JBoss EAP 5.2 default server.
2.  Install, configure, and start JBoss ON system.
3.  Create custom shutdown script for JBoss EAP server which sleeps for a bit and then does nothing:

        cat >"${JBOSS_HOME}"'/bin/custom-shutdown' <<EOF
#!/bin/sh
# This script will simply block for 5 seconds and then exits.
JBOSS_HOME="${JBOSS_HOME}"

/bin/sleep 5s
exit 1
EOF
        chmod +x "${JBOSS_HOME}"'/bin/custom-shutdown'
        
4.  Import JBoss EAP default server into inventory.
5.  Configure EAP resource connection settings to use custom-shutdown script for shutdown command.
6.  Invoke the restart operation for the JBoss EAP resource.

Actual results:
Restart operation reports success yet the existing process is still running and was not restarted (shutdown failed and start failed).

Expected results:
Restart operations reports failure due to the shutdown operation failing (i.e. JBoss EAP resource still AVAIL)

Additional info:
This appears to be a result of a change that may have been introduced since the EAP 4 plug-in or in how exception handling was being used.

Specifically, the restart operation is expecting the underlying shutdown and start operations to throw an exception if there is a failure. However, those methods no longer do that. Instead, they set the errorMessage of the operation response to indicate that a failure occurred and what the failure was. This means that instead of expecting an exception to be thrown, the restart operation should also expect that a failure message could be set and treat the message appropriately.