Change capabilities to uint64_t

- Since the capabilities are a bitmask, it is better if an unsigned
  integral type is used.
- Since the function is part of an ABI, it is better if an explicit
  size is used.
- 64-bits so that there also is room for independent filter
  capabilities.

include/maxscale/router.h

@@ -82,7 +82,7 @@ typedef struct router_object
                            DCB*           backend_dcb,
                            error_action_t action,
                            bool*          succp);
-    int     (*getCapabilities)();
+    uint64_t (*getCapabilities)();
 } ROUTER_OBJECT;
 
 /**
@@ -90,7 +90,7 @@ typedef struct router_object
  * must update these versions numbers in accordance with the rules in
  * modinfo.h.
  */
-#define ROUTER_VERSION  { 1, 0, 0 }
+#define ROUTER_VERSION  { 2, 0, 0 }
 
 /**
  * Router capability type. Indicates what kind of input router accepts.