make dumping vcpu info look better

make dumping vcpu info look better

and more consistent. In fact, before this changes, it looks
like this:

 (XEN) VCPU information and callbacks for domain 0:
 (XEN)     VCPU0: CPU4 [has=F] poll=0 upcall_pend = 00, upcall_mask = 00 dirty_cpus={4} cpu_affinity={0-15}
 (XEN) cpu_soft_affinity={0-15}
 (XEN)     pause_count=0 pause_flags=1
 (XEN)     No periodic timer

After, it looks like this:

 (XEN) VCPU information and callbacks for domain 0:
 (XEN)     VCPU0: CPU4 [has=F] poll=0 upcall_pend=00 upcall_mask=00 dirty_cpus={4}
 (XEN)     cpu_hard_affinity={0-15} cpu_soft_affinity={0-15}
 (XEN)     pause_count=0 pause_flags=1
 (XEN)     No periodic timer

So, consistently _not_ put space between fields and '=',
and consistently _not_ use ',' as separator. Also, put the
info about affinity on the same, properly indented.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Reviewed-by: George Dunlap <george.dunlap@eu.citrix.com>
Reviewed-by: Meng Xu <mengxu@cis.upenn.edu>