* Canadian telecom wants to merge share classes * Mason Capital seeking to block one-for-one consolidation * Proxy advisor backs Telus ahead of Oct. 17 meeting Oct 5 (Reuters) - Proxy advisory firm Glass Lewis & Cobacked Telus Corp in its dispute with top investor MasonCapital Management LLC on Friday, with a report viewed byReuters that recommended that investors approve a proposed shareconsolidation. The Canadian telecom company wants to convert all non-votingTelus shares to voting shares, on a one-for-one basis. Investorswill vote on the matter at an Oct. 17 meeting.