Fix missing locks in InstanceRecreateDisks
Fix missing locks in InstanceRecreateDisks

In case of in-place recreate-disks operation, all node locks were released
before starting the actual execution.

Signed-off-by: Bernardo Dal Seno <dcdd79c5479cb9d1329ec01d126f02cb045aa103@google.com>
Reviewed-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>

dimara/ganeti,leshchevds/ganeti,leshchevds/ganeti,grnet/snf-ganeti,onponomarev/ganeti,bitemyapp/ganeti,ganeti/ganeti,yiannist/ganeti,onponomarev/ganeti,apyrgio/snf-ganeti,andir/ganeti,ganeti/ganeti,apyrgio/ganeti,mbakke/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,yiannist/ganeti,ganeti/ganeti,leshchevds/ganeti,ganeti-github-testing/ganeti-test-1,yiannist/ganeti,apyrgio/snf-ganeti,andir/ganeti,mbakke/ganeti,grnet/snf-ganeti,dimara/ganeti,andir/ganeti,apyrgio/ganeti,bitemyapp/ganeti