jboss-cli.ps1 script doesn't return exit value correctly

Steps to reproduce:

1. start Command prompt in Windows
2. PowerShell -ExecutionPolicy Bypass -File jboss-cli.ps1 "--commands=nonsence" --timeout=10000
3. echo %ERRORLEVEL%
   • "0" is printed, "1" should be printed
4. add "exit 5" to the end of jboss-cli.ps1 file
5. PowerShell -ExecutionPolicy Bypass -File jboss-cli.ps1 "--commands=nonsence" --timeout=10000
6. echo %ERRORLEVEL%
   • "5" is printed

cc: jperkins-rhn, eduda_jira, jdenise@redhat.com