Remove unused remote file handler method (directWriteLines)

Change-Id: I16be5717b492b1093a26e5a5c85cfe5a9d1b07e9
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/27640
Reviewed-by: Saggi Mizrahi <smizrahi@redhat.com>