[FEATURE] Set exit status in CLI scripts

Shell commands usually set the exit status > 0 in case an error occured.
This change sets the exit status if the CLI script invocation fails or
an exception is thrown by the CLI script so failed executions can be
detected.

Change-Id: Idfc9cd76657c9b83a2bcc83d0b9f8bdd0e2d1bca
Resolves: #28700
Releases: 4.7
Reviewed-on: http://review.typo3.org/8999
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter
Reviewed-by: Tolleiv Nietsch
Tested-by: Tolleiv Nietsch