CANBERRA (Reuters Life!) - Australians, long regarded as a nation of beer drinkers rivaled only by the Germans, seem to be turning soft, or sober. After 113 years, the country's biggest selling beer, Victoria Bitter, or VB, is to be produced in a mid-strength version to keep pace with the country's fast-changing beer tastes. VB, with its distinctive green label, has since 1894 been a staple of hard-drinking backyard barbecues, student revels and football games, not to mention healthy overseas exports. Now brewer Foster's has decided for the first time to produce the beer in a weaker yellow-label version with...