addons: vrf: removing ifaceobj.name from exception message

addons: vrf: removing ifaceobj.name from exception message

Ticket: None
Reviewed By:
Testing Done:

The function _create_vrf_dev is surrounded by a try/catch as follow:
    try:
        vrf_table = self._create_vrf_dev(ifaceobj, vrf_table)
    except Exception, e:
        self.log_error('%s: %s' %(ifaceobj.name, str(e)), ifaceobj)

Thus we shouldn't include the ifaceobj.name in any error message passed to
log_error(). Since this function will raise an exception by default, it will
result in something like this:

error:br0.4002: red: red: create failed (cmd 'ip link add name red type vrf table 1001' failed: returned 1 ...[snip]
error:red: red: create failed (cmd 'ip link add name red type vrf table 1002' failed: returned 1 ...[snip]

after this patch:
error: red: create failed (cmd 'ip link add name red type vrf table 1002' failed: returned 1 ... [snip]

Signed-off-by: Julien Fortin <julien@cumulusnetworks.com>