This allows the usage information to be shown when a bad command-line
option is used, and rc=3 to be returned.

 * 0 for success
 * 1 for errors or warnings if reportwarning enabled
 * 2 for fatal errors and halts

When testing the connection via ssh forced command, if the remote path
is an empty directory (instead of nonexistent), the handler bails even
tough the connection is successful.

Co-authored-by: Emil Breiner <emil.breinr@krumedia.com>

Add a testsuite

See merge request liberate/backupninja!46

Use test values with whitespace to catch quoting issues.

Auto-find test component/file and check status code.