rpc: Increase bound limit for virDomainGetJobStats

https://bugzilla.redhat.com/show_bug.cgi?id=1012818

Commit 6d7d0b18 (in 1.1.2) added bounds
checking to virDomainGetJobStats. But even at that time the API was able
to return 20 parameters while the limit was set to 16.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/remote/remote_protocol.x

@@ -230,7 +230,7 @@ const REMOTE_NODE_MEMORY_PARAMETERS_MAX = 64;
 const REMOTE_DOMAIN_MIGRATE_PARAM_LIST_MAX = 64;
 
 /* Upper limit on number of job stats */
-const REMOTE_DOMAIN_JOB_STATS_MAX = 16;
+const REMOTE_DOMAIN_JOB_STATS_MAX = 64;
 
 /* Upper limit on number of CPU models */
 const REMOTE_CONNECT_CPU_MODELS_MAX = 8192;