[COOK-1085] - workaround ruby 1.9 Array#to_s
[COOK-1085] - workaround ruby 1.9 Array#to_s

On Ruby <= 1.8, use the Array#to_s behavior, otherwise join the role,
which is mildly distasteful since multiple role names in the data bag
item will be joined. The *proper* fix will be to document in the
application cookbook that a string should be used instead of an Array.

philosowaffle/database,chrispernicano/database,jeffutter/database,seancoyne/database,chewi/database,krobertson/database-cookbook,rackspace-cookbooks/rackspace_database,ehartmann/database,rtenijenhuis/database,kangaechu/database,dividedmind/database,rtenijenhuis/database,DonorsChoose/chef-database,auser/database,mveitas/database,theprobie/database,dwashko/chef-database,Ecodev/database,opscode-cookbooks/database,schubergphilis/database,jumski/database-cookbook,chewi/database,mblomdahl/database,chef-cookbooks/database,mapleoin/cookbook-database,theprobie/database,cookbooks/oc-database,birarda/database,miguelaferreira/database,rtenijenhuis/database,VertiPub/database,kisoku/database,numbata/database,finnlabs/cookbook-database,DmZ/database,burnzy/database,axsuul/cookbook-database,KirstensAmazing/database,seancoyne/database,twobits-cz/database,schubergphilis/database,petere/database,GannettDigital/chef-database,FundingCircle/database,anveo/database,ovaistariq/database,ovaistariq/database,h4ck3rm1k3/database,bwtaylor/database,axsuul/cookbook-database,alfert/camp-cookbooks-database,chewi/database,miguelaferreira/database,marbe/database,sstelfox/database,jhx/cookbook-database,miguelaferreira/database,Youscribe/database,opscode-cookbooks/database,realloc/cookbook-database,clkao-cookbooks/database,bdols/database,yakara-ltd/database,tjchambers/database,newsdev/database,seancoyne/database,RobertNorthard/database,VertiPub/database,tezz123/database,yakara-ltd/database,chef-cookbooks/database,hornos/database,philosowaffle/database,theprobie/database,burnzy/database,jakshi/database,aauthor/database,kalabiyau/database,BarthV/database,Ecodev/database,schubergphilis/database,grengojbo/database,chr4-cookbooks/database,pronix/database,RobertNorthard/database,ovaistariq/database,michaelklapper/database,burnzy/database,h4ck3rm1k3/database,philosowaffle/database,WanderingStar/database,BarthV/database,opscode-cookbooks/database,chr4-cookbooks/database,chr4-cookbooks/database,jaredrussell/database,manuelvanrijn/cookbook-database,mattray/database,cloudjutsu/database,VertiPub/database,GannettDigital/chef-database,ProTip/protip_database,RobertNorthard/database,dwashko/chef-database,ProTip/database,safe-net/database,teleological/database,pvieytes/database,josephholsten/database,reset/database-cookbook,axsuul/cookbook-database,BarthV/database,h4ck3rm1k3/database,Casecommons/database,dwashko/chef-database,hw-cookbooks/database,yakara-ltd/database,intel352/database,Ecodev/database,jtimberman/database