Add name attribute to metadata
Use init_command instead of *_command(s)

Avoid to specify each command separatly.
Add sonar init.d script template

Add sonar init.d script template that calls the sonar.sh script.
Also install this service.
Update attribute defaults and doc

Update attributes default to more reasonable defaults:
 * x64 install by default
 * install latest sonar version

Put some attributes in the metadata files.