Delete the broken link for chef-ha-drbd plugin.
Delete the broken link for chef-ha-drbd plugin.

Old versions of chef-server (prior to 13) created a link in
/var/opt/opscode/plugins pointing to /opt/opscode/chef-server-plugin.rb.
We removed that file, but when upgrading that link remained and would break the
chef-server-ctl reconfigure run.
Remove the link as part of postinst to prevent this.

Signed-off-by: Prajakta Purohit <e0b6074fb36005ab38b637036277c00627bb386c@opscode.com>

chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server