Use char * instead of security_context_t
Use char * instead of security_context_t

security_context_t has been deprecated for years in favour of a plain
char * type.

Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt-sandbox,libvirt/libvirt-sandbox,libvirt/libvirt-sandbox