Adding guards to prevent Chef 11 issues with source_url and issues_url.
Adding guards to prevent Chef 11 issues with source_url and issues_url.

nickryand/cloudcli-cookbook,awslabs/awscli-cookbook,nickryand/cloudcli-cookbook,cmlicata/cloudcli-cookbook,smartpcr/awscli-cookbook,cmlicata/cloudcli-cookbook