generator: Rename 'add_drive_opts' API to 'add_drive'.

By using the once_had_no_optargs flag, this change is backwards
compatible for callers (except Haskell, PHP and GObject as discussed
in earlier commit).

python/examples/create_disk.py

@@ -16,7 +16,7 @@ f.close ()
 g.set_trace (1)
 
 # Attach the disk image to libguestfs.
-g.add_drive_opts (output, format = "raw", readonly = 0)
+g.add_drive (output, format = "raw", readonly = 0)
 
 # Run the libguestfs back-end.
 g.launch ()

python/examples/guestfs-python.pod

@@ -8,7 +8,7 @@ guestfs-python - How to use libguestfs from Python
 
  import guestfs
  g = guestfs.GuestFS ()
- g.add_drive_opts ("disk.img", format="raw", readonly=1)
+ g.add_drive ("disk.img", format="raw", readonly=1)
  g.launch ()
 
 =head1 DESCRIPTION

python/examples/inspect_vm.py

@@ -9,7 +9,7 @@ disk = sys.argv[1]
 g = guestfs.GuestFS ()
 
 # Attach the disk image read-only to libguestfs.
-g.add_drive_opts (disk, readonly=1)
+g.add_drive (disk, readonly=1)
 
 # Run the libguestfs back-end.
 g.launch ()

python/t/060-optargs.py

@@ -19,7 +19,7 @@ import os
 import guestfs
 
 g = guestfs.GuestFS()
-g.add_drive_opts ("/dev/null")
-g.add_drive_opts ("/dev/null", readonly = 1)
-g.add_drive_opts ("/dev/null", iface = "virtio", format = "raw")
+g.add_drive ("/dev/null")
+g.add_drive ("/dev/null", readonly = 1)
+g.add_drive ("/dev/null", iface = "virtio", format = "raw")
 g.close ()

python/t/rhbz811650.py

@@ -25,7 +25,7 @@ f.close ()
 g = guestfs.GuestFS ()
 
 # Deliberate error: the disk format is supposed to be raw.
-g.add_drive_opts ("test.img", format="qcow2");
+g.add_drive ("test.img", format="qcow2");
 
 # Because error() wasn't being called, guestfs_last_error would return
 # NULL, causing a segfault in the Python bindings (RHBZ#811650).