Added riak_core_apl:active_owners call to get preflist of all active primary nodes.
Added riak_core_apl:active_owners call to get preflist of all active primary nodes.

glickbot/riak,GabrielNicolasAvellaneda/riak,basho/riak_search,DavidAlphaFox/riak,xuejianhai/riak_search,xuejianhai/riak,planobe/riak,planobe/riak,elkingtonmcb/riak,authbox-lib/riak,yangchengjian/riak,biddyweb/riak,wwezhuimeng/riak_search,basho/riak_search,laurenrother/riak,xuejianhai/riak_search,amyvmiwei/riak,wwezhuimeng/riak_search,basho/riak