* Sterling falls as poll finds support for Scottish independence* Chinese trade data for August shows domestic economy sluggish* Most European shares sag as FTSE leads way lower* Brent oil drops below $100 a barrelBy Marc JonesLONDON, Sept 8 (Reuters) - Sterling fell to a 10-month low while British shares and government bonds showed strains on Monday, as a poll put the campaign for Scotland to spl