LONDON (Reuters) - British employers turned a bit less pessimistic about hiring and investment this month as the government moved to relax its coronavirus lockdown of much of the economy, according to a survey published by a recruiting industry body.The Recruitment & Employment Confederation's Business confidence measure remained negative but rose to -10 from -21 in April. Short-term demand for permanent staff improved to -5 from -9."Coronavirus has caused a huge slowdown in the labour market,..