pragma_boot: code refactoring for supporting deployment of compute node

added driver_manager to manager path to drivers
pragma_boot: now boot all the compute nodes in the cluster

it still needs some testing
pragma_boot: remove debugging functions
pragma_boot: added debug options which print only commands

It prints only the commands that will be executed but it does not
execute them
readme: add number of cpus per node to vc-out.xml
pragma_boot: now supports to spin compute nodes

Merge branch 'devel_boot_compute'

Conflicts:
	bin/pragma_boot