vzmigrate: use --sparse on the first rsync

vzmigrate is expanding sparse files inside the migrated container.

This patch adds the --sparse option to the first rsync in vzmigrate,
yo help with sparse files during a migration.

Tested by:

1) Creating a sparse file in the container:
	# dd if=/dev/zero of=sparse seek=1000000 count=1
	# du -hs sparse
	12K     sparse

2) Migrating the container:
	# vzmigrate -r no --keep-dst -v host2 CTID

And with this patch, sparse files are not expanded, as expected.

http://bugzilla.openvz.org/2002
1 file changed