Fix generated Rakefile to avoid circular dependencies
Fix generated Rakefile to avoid circular dependencies

When the target host is 'default', 'default' task will be triggered.
However, 'default' task depends on all tasks, then the circular
dependency will be occured.

elibus/serverspec,serverspec/serverspec,tacahilo/serverspec,supertylerc/serverspec,mizzy/serverspec,aschmidt75/serverspec,RoboticCheese/serverspec,ShawInnes/serverspec,DarrellMozingo/serverspec,mekf/serverspec,inokappa/serverspec,minimum2scp/serverspec,pfaffle/serverspec,uroesch/serverspec,ihassin/serverspec,sergueik/serverspec,Plus81/serverspec,higanworks/serverspec