Note that if you already use memcached for the main cache, there isn't really any reason to switch to redis unless you need replication or persistence.
Anyway, to use it for sessions, if you had $wgSessionCacheType explicitly set to something, then you'd need to change that too (like to 'pecl-redis'). In any case, it doesn't hurt to be explicit. This all assumes that $wgSessionsInObjectCache = true as well.
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