ABD optimized page allocation code

* Convert ABD to use the Linux Kernel scatterlist implementation
  instead of the hand rolled one from illumos.

* Scatter ABDs are preferentially populated with higher order
  compound pages from a single zone.  Allocation size is
  progressively decreased until it can be satisfied without
  performing reclaim or compaction.

* An alternate page allocator is provided for kernels older
  than 3.6 and for CONFIG_HIGHMEM systems.  This allocator
  is designed as a fallback for maximum compatibility.

* Extended abdstats to provide visibility in the the allocator.

* Add cached value for PAGESIZE in userspace.

Contributions-by:
Chunwei Chen <david.chen@osnexus.com>
Gvozden Neskovic <neskovic@gmail.com>
Jinshan Xiong <jinshan.xiong@intel.com>
Isaac Huang <he.huang@intel.com>
David Quigley <david.quigley@intel.com>
Brian Behlendorf <behlendorf1@llnl.gov>

lib/libspl/include/sys/param.h

@@ -57,8 +57,11 @@
 #define	MAXUID		UINT32_MAX	/* max user id */
 #define	MAXPROJID	MAXUID		/* max project id */
 
-#ifndef	PAGESIZE
-#define	PAGESIZE	(sysconf(_SC_PAGESIZE))
+#ifdef	PAGESIZE
+#undef	PAGESIZE
 #endif /* PAGESIZE */
 
+extern size_t spl_pagesize(void);
+#define	PAGESIZE	(spl_pagesize())
+
 #endif