Added templates for CoreOS support - feature 7652

Renamed CoreOS to coreos

• made params optional

fixed indent

fixed indent

Added correct header to CoreOS files

renamed cloud-config snippet

renamed files, readded files with proper names

Corrected parameter names and removed spare actions

Added fake disklayout

Included the yaml option ssh_authorized_keys in if statement

removed stray -

Added support for multiple ssh PSK

Indent inner loop for clarity

changed ; to && only execute the last commands when installation was successful