PARIS, March 7 (Reuters) - French truck drivers and garbage collectors joined nationwide strikes against President Emmanuel Macron's pension reform plans on Tuesday as trade unions stepped up their campaign to force a policy U-turn. The CFDT, now France's biggest trade union and generally reform-minded, has not committed to the rolling strikes sought by the hardleft CGT, Force Ouvriere (FO) and others. "If he gives in, he won't be able to carry out more reforms, it would be the end of his (second) term