Introduce a new kind of bindings tests, 090-retvalues, to check all the
possible return values in bindings; start implementing them for
scripting languages such as GObject introspection, Perl, PHP, Python,
and Ruby, reusing existing implementations where existing.
Rename the existing tests according to the naming/numbering described in
guestfs-hacking(1), and improve the current ones:
- guestfs_php_001.phpt: rename to guestfs_020_create.phpt
- guestfs_php_003.phpt: rename to guestfs_070_optargs.phpt
- guestfs_php_bindtests.phpt: rename to guestfs_090_bindtests.phpt
- guestfs_090_version.phpt: new, checks taken from the former
guestfs_php_002.phpt
- guestfs_100_launch.phpt: new, modelled after the equivalent in e.g.
OCaml/Perl/Python
- guestfs_php_002.phpt: remove, as what it did is now covered by
090_version and 100_launch
