* src/hash.c, src/internal.h: Switch the uuid parameter in virGetDomain

* src/hash.c, src/internal.h: Switch the uuid parameter in virGetDomain
  to be of type 'unsigned char' since its a raw UUID we're passing in,
  not a printable one.
* src/libvirt.c: Remove bogus "unsigned char" -> "char" type casts. Hook
  up the "domainLookupByID", "domainLookupByUUID", "domainLookupByName"
  and "domainGetInfo" driver backend functions.
Daniel