lib: Add new C API calls: guestfs_push_error_handler,

guestfs_pop_error_handler.

The addition of these calls makes it much simpler to temporarily
disable or ignore errors:

 guestfs_push_error_handler (g, NULL, NULL);
 guestfs_mkdir (g, "/foo"); /* We don't care if this fails. */
 guestfs_pop_error_handler (g);

Note these calls are used by the C API only.  They are not necessary
in other languages, because those map errors to exceptions.

The subsequent commits change existing code to use push/pop instead of
laboriously saving and restoring the error handler.

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