Remove fileUtils.safeUnlink().

safeUnlink() usage replaced by utils.rmFile() calls.

Change-Id: I8d6531bdf43aa9ed74dff5a54a54bb476500298e
Signed-off-by: Eduardo <ewarszaw@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/11424
Reviewed-by: Yeela Kaplan <ykaplan@redhat.com>
Tested-by: Daniel Paikov <paikov@gmail.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>