Add config/parse tests for options and option args with spaces.
Add config/parse tests for options and option args with spaces.

If an option name has a space at the beginning then it will be considered an invalid command, but a space at the end is an invalid option. Add tests for these conditions.

Spaces in option arguments should be preserved, so add a test to be sure this is true.

pgbackrest/pgbackrest,pgmasters/backrest,pgmasters/backrest,pgbackrest/pgbackrest,pgbackrest/pgbackrest