Remove symlink if exists

On sync, if the symlink already exists, an exception would
be thrown.  This change removes the file if it already
exists.

Bug 1132

Change-Id: I151a96adcac5d7cd51b84c2770f498a78d7d68be
Signed-off-by: beierlm <mark.beierl@canonical.com>
(cherry picked from commit 6d72d5cf)