RPC: Support up to 16384 cpus on the host and 4096 in the guest

The RPC limits for cpu maps didn't allow to use libvirt on ultra big
boxes. This patch increases size of the limits to support a maximum of
16384 cpus on the host with a maximum of 4096 cpus per guest.
The full cpu map of such a system takes 8 megabytes and the map for
vcpu pinning is 2 kilobytes long.

src/remote/remote_protocol.x

@@ -82,13 +82,13 @@ const REMOTE_DOMAIN_ID_LIST_MAX = 16384;
 const REMOTE_DOMAIN_NAME_LIST_MAX = 16384;
 
 /* Upper limit on cpumap (bytes) passed to virDomainPinVcpu. */
-const REMOTE_CPUMAP_MAX = 256;
+const REMOTE_CPUMAP_MAX = 2048;
 
 /* Upper limit on number of info fields returned by virDomainGetVcpus. */
-const REMOTE_VCPUINFO_MAX = 2048;
+const REMOTE_VCPUINFO_MAX = 16384;
 
 /* Upper limit on cpumaps (bytes) passed to virDomainGetVcpus. */
-const REMOTE_CPUMAPS_MAX = 16384;
+const REMOTE_CPUMAPS_MAX = 8388608;
 
 /* Upper limit on migrate cookie. */
 const REMOTE_MIGRATE_COOKIE_MAX = 16384;