Description of problem:
After invoking the start operation on an AS7/EAP6 resource, the operation status is reported as failure even thought the resource is started and the script output indicates that the resource was started successfully and exited cleanly with return code 0.

The only time the start operation reports success is when the start script blocks (i.e. does not return).

Version-Release number of selected component (if applicable):
4.4.0.JON311GA

How reproducible:
Always

Steps to Reproduce:
1.  Install and configure EAP 6 standalone server
2.  Create custom standalone.sh start script wrapper which returns an exit code:

cat > "${JBOSS_HOME}/bin/standalone-wrapper.sh" << EOF
#!/bin/sh

DIRNAME=\$(dirname "\$0")

eval \"\${DIRNAME}/standalone.sh\" "\$@" \&
exit \$?
EOF
chmod +x "${JBOSS_HOME}/bin/standalone-wrapper.sh"

3.  Using the newly created start script wrapper, start the EAP 6 standalone server
4.  Start JBoss ON system
5.  Import EAP 6 standalone server into inventory
6.  Configure the EAP 6 resource's connection settings to use the custom start script wrapper standalone-wrapper.sh
7.  After EAP 6 resource shows availability of UP, invoke its shutdown operation
8.  Wait until EAP 6 resource is reported as DOWN
9.  Invoke the EAP 6 resource's start operation

Actual results:
EAP server is started but operation status in UI shows Failure with the following error message available from the UI:

    java.lang.Exception: Start failed with error code 0:

	    at org.rhq.core.pc.operation.OperationInvocation.run(OperationInvocation.java:278)
	    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	    at java.lang.Thread.run(Thread.java:636)

Expected results:
EAP server is started and the operation status in the UI shows Success.

Additional info:
This is a direct result of incorrectly handling the process exit code from .ProcessExecutionResults.getExitCode() in BaseServerComponent.startServer(). We treat <null> as success when really 0 is success and <null> simply means that the request has not yet returned or is blocking or timed out.

To fix this:

diff --git a/modules/plugins/jboss-as-7/src/main/java/org/rhq/modules/plugins/jbossas7/BaseServerComponent.java b/modules/plugins/jboss-as-7/src/main/java/org/rhq/modules/plugins/jbossas7/Ba
index 98a46d2..3dc12de 100644
--- a/modules/plugins/jboss-as-7/src/main/java/org/rhq/modules/plugins/jbossas7/BaseServerComponent.java
+++ b/modules/plugins/jboss-as-7/src/main/java/org/rhq/modules/plugins/jbossas7/BaseServerComponent.java
@@ -330,7 +330,7 @@ public abstract class BaseServerComponent<T extends ResourceComponent<?>> extend
         logExecutionResults(results);
         if (results.getError() != null) {
             operationResult.setErrorMessage(results.getError().getMessage());
-        } else if (results.getExitCode() != null) {
+        } else if (results.getExitCode() != null && results.getExitCode() != 0) {
             operationResult.setErrorMessage("Start failed with error code " + results.getExitCode() + ":\n" + results.getCapturedOutput());
         } else {
             // Try to connect to the server - ping once per second, timing out after 20s.