Accept a worker mode that specifies the rate as max
Accept a worker mode that specifies the rate as max

Accept {rate, max} as synonymous to just the atom 'max' to indicate a
worker should send requests at the maximum rate possible. This change
is primarly to make life easier for setting up automated testing tools
and does not prevent any existing configurations from working.

marksteele/basho_bench,windkit/basho_bench,basho/basho_bench,SyncFree/basho_bench,basho/basho_bench,SyncFree/basho_bench,linearregression/basho_bench,marksteele/basho_bench,linearregression/basho_bench,basho/basho_bench,mrallen1/basho_bench,mrallen1/basho_bench,leo-project/basho_bench,fogfish/basho_bench,GabrielNicolasAvellaneda/basho_bench,marksteele/basho_bench,marksteele/basho_bench,fogfish/basho_bench,leo-project/basho_bench,linearregression/basho_bench,linearregression/basho_bench,Chyaboiii/basho_bench,Chyaboiii/basho_bench,GabrielNicolasAvellaneda/basho_bench,ricardobcl/basho_bench,basho/basho_bench,GabrielNicolasAvellaneda/basho_bench,mrallen1/basho_bench,windkit/basho_bench,ricardobcl/basho_bench,fogfish/basho_bench,fogfish/basho_bench,mrallen1/basho_bench,GabrielNicolasAvellaneda/basho_bench