By Steve Scherer and Carlos Osorio OTTAWA (Reuters) -Canadian police on Saturday used pepper spray and stun grenades, and made dozens of arrests as they cleared demonstrators from the street in front of parliament, where they have been camping for more than three weeks to protest against pandemic restrictions. A total of 170 arrests have been made in two days, Ottawa’s interim police chief, Steve Bell, told reporters. Police by afternoon had dispersed the main portion of the blockade in front of parliament and the prime minister’s office. After nightfall, police sent a message on Twitter to de…