By Michael Holden and Andrew MacAskill LONDON (Reuters) -A “fanatical Islamist” inspired by Islamic State was found guilty on Monday of murdering veteran British lawmaker David Amess by knifing him to death in a frenzied attack in a church where he was meeting voters. Ali Harbi Ali, 26, a British citizen and son of a former media adviser to a prime minister of Somalia, repeatedly stabbed Amess in an attack last October for what he said was revenge for the lawmaker’s support for airstrikes on Syria. Prosecutors said he was a “committed, fanatical, radicalised Islamist terrorist”. “This was a ho…