pkg/smartos : add compatible manifests for the SmartOS platform

Manifests in pkg/solaris are using /etc/salt which is innapropriate
for SmartOS design (/etc is removed @reboot). I suggest to add a
new directory in order to preserve existing Solaris installations
(and SmartOS one which are based on those manifests).
Merge pull request #5011 from virtua-network/develop

pkg/smartos : add compatible manifests for the SmartOS platform