By David Stanway SHANGHAI (Reuters) -Chinese authorities on Tuesday extended a lockdown in Shanghai to cover all of the financial centre’s 26 million people, despite growing anger over quarantine rules in the city, where latest results show only 268 symptomatic daily COVID-19 cases. In a major test of China’s zero-tolerance strategy to eliminate the novel coronavirus, the government widened the lockdown to eastern parts of the city and extended until further notice restrictions in western districts, which had been due to expire on Tuesday. The broader lockdown came after testing saw asymptomat…