add support of script load command by broadcast#424

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umegaya wants to merge 3 commits intotwitter:masterfrom umegaya:script_load

+1,622-10

Commits on Oct 21, 2015

redis: handling SCRIPT command
umegaya
committed
able to set arbitery commands as 'broadcast' command.
umegaya
committed
add new test with shell script, because original python test seems broken (even at https://travis-ci.org/idning/twemproxy , only do build and install test).
umegaya
committed