By Elizabeth Piper, Andrew MacAskill and Kylie MacLellan LONDON (Reuters) – Britain’s interior minister quit on Wednesday with a broadside at Liz Truss before her lawmakers openly quarrelled in parliament, underscoring the erosion of the prime minister’s authority after just weeks in the job. The departure of Suella Braverman, over a “technical” breach of government rules, means Truss has now lost two of her most senior ministers in less than a week, both replaced by politicians who had not backed her for the leadership. Hours after the resignation, lawmakers openly rowed and jostled amid conf…