Update riakeds to 1.2.1.

Bugs fixed:
* LevelDB - Restrict number of input files to a compaction.
* riak_pipe - Avoid race to code:load_file by using code:ensure_loaded instead
* riak - Beams in basho-patches don't take precedence over existing code
* merge_index - Fix iterator API (Thanks to Arnaud Wetzel)
* riak_core - Restart vnode worker pool in case of crash
* riak_kv - Resolve 2I timeout error from case clause
* riak_kv - Add retry on eleveldb lock errors during open for up to 1 minute.
* bitcask - Adds "grace period" to stop just-written files from expiring
* riak_repl - Seperate the bounded_queue out into a seperate process
* riak_repl - Better cleanup of open file handles on fullsync exit
* riak_repl - Avoid dropping realtime messages right after election
* erlang_js - ejsLog() kills the erlang vm in a reduce
* bitcask - Validate hint files generated after merge
* riak_core - Remove publish_capabilities race condition
Reflect new PLIST entries
Improve the way how the tarball is fetched from github
Merge branch 'master' of git://github.com/joyent/pkgsrc-joyent