Initial SUSE / openSUSE support for rabbitmq-server

Metadata.rb not sets suse as supported os.

Recipe default installs rabbitmq-server using package resource (using zypper). This works on openSUSE but for SLE we need to have proper repository setup. It menas that before calling this cookbook another cookbook which sets proper repository needs to be setup (eg. network/messaging).
Merge pull request #3 from tpaszkowski/addsuse

Initial SUSE / openSUSE support for rabbitmq-server