Remove copyright from config/init files

Claiming copyright on configuration: Oh!
init script: Fix bashism

sleep only takes one integer
Allow to generate other files than bin/default/shinken
Generate main init script too
Init script: Move all guessable parameters to init script

shinken.default should only be used to override settings
Init script:  shinken.default is not needed anymore
Init scrip: SHINKENCFG is always defined
Init scrip: Use SHINKENSPECIFICCFG when available