tests: added a couple of tag delete/create tests
tests: added a couple of tag delete/create tests

pavlobaron/disco_playground,scrapinghub/disco,scrapinghub/disco,mwilliams3/disco,pombredanne/disco,discoproject/disco,ErikDubbelboer/disco,ErikDubbelboer/disco,mwilliams3/disco,ErikDubbelboer/disco,ErikDubbelboer/disco,ktkt2009/disco,ktkt2009/disco,pombredanne/disco,mwilliams3/disco,mwilliams3/disco,simudream/disco,beni55/disco,mwilliams3/disco,pombredanne/disco,ErikDubbelboer/disco,oldmantaiter/disco,seabirdzh/disco,mozilla/disco,ktkt2009/disco,discoproject/disco,oldmantaiter/disco,beni55/disco,seabirdzh/disco,simudream/disco,discoproject/disco,beni55/disco,pooya/disco,seabirdzh/disco,pooya/disco,scrapinghub/disco,ktkt2009/disco,mozilla/disco,pombredanne/disco,seabirdzh/disco,pavlobaron/disco_playground,mozilla/disco,scrapinghub/disco,discoproject/disco,oldmantaiter/disco,pombredanne/disco,oldmantaiter/disco,pavlobaron/disco_playground,ktkt2009/disco,beni55/disco,seabirdzh/disco,simudream/disco,simudream/disco,mozilla/disco,pooya/disco,oldmantaiter/disco,beni55/disco,simudream/disco,pavlobaron/disco_playground,discoproject/disco,pooya/disco