Add temporary IP throttle exception for Kannada workshop

Event ....... Editing workshop at the SDM College, Ujire, Karnataka
From ........ 2013-09-15 00:00 UTC
To .......... 2013-09-15 13:00 UTC
IPs ......... 218.248.46.167
              218.248.46.170
Wikis ....... kn.wikipedia
              commons.
Threshold ... 50

Bug: 53980
Change-Id: I37d27bd184d759af38f0b7f3c6065651863a194a