Revert r265367:
Use of calloc instead of malloc in regex (from OpenBSD).

In this case the change makes no sense since we are using realloc() later.

Reported by:	ache
Modify the "-p" option to be more flexible when associating a 'vcpu' with
a 'hostcpu'. The new format of the argument string is "vcpu:hostcpu".

This allows pinning a subset of the vcpus if desired.

It also allows pinning a vcpu to more than a single 'hostcpu'.

Submitted by:	novel (initial version)