Remove autotools products

Remove all of the generated autotools products from the repository
and update the .gitignore files accordingly.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue zfsonlinux/zfs#718

.gitignore

@@ -29,18 +29,25 @@
 .DS_Store
 modules.order
 Makefile
+Makefile.in
 
 #
 # Top level generated files specific to this top level dir
 #
-/Makefile
+/configure
 /config.log
 /config.status
 /libtool
 /spl_config.h
 /spl.spec
 /spl-modules.spec
+/spl.release
+/dkms.conf
+/PKGBUILD-spl
+/PKGBUILD-spl-modules
 /stamp-h1
+/aclocal.m4
+/autom4te.cache
 
 #
 # Top level generic files