COOK-2247 pkgs should be a list of Strings

pkgs.each doesn't work on a String, it must be a list of Strings
package[tar,make] added client_source->bash[compile-nagios-plugins]'
make and tar needed for building on centos, rhel, and others
Merge pull request #98 from hh/patch-2

COOK-2247 pkgs should be a list of Strings