Add .gitignore files to exclude build products

.gitignore

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+#
+# N.B.
+# This is the toplevel .gitignore file.
+# This is not the place for entries that are specific to
+# a subdirectory.  Instead add those files to the
+# .gitignore file in that subdirectory.
+#
+# N.B.
+# Please use 'git ls-files -i --exclude-standard'
+# command after changing this file, to see if there are
+# any tracked files which get ignored after the change.
+
+#
+# Normal rules
+#
+*.[oa]
+*.ko
+*.lo
+*.la
+*.mod.c
+*~
+*.swp
+.*.cmd
+.deps
+.libs
+.DS_Store
+modules.order
+Makefile
+
+#
+# Top level generated files specific to this top level dir
+#
+/Makefile
+/config.log
+/config.status
+/libtool
+/zfs_config.h
+/zfs.spec
+/zfs-modules.spec
+/stamp-h1
+/.script-config
+
+#
+# Top level generic files
+#
+!.gitignore
+tags
+TAGS
+cscope.*

cmd/zdb/.gitignore

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+/zdb

cmd/zfs/.gitignore

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+/zfs

cmd/zinject/.gitignore

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+/zinject

cmd/zpool/.gitignore

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+/zpool

cmd/ztest/.gitignore

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+/ztest

module/.gitignore

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+/.tmp_versions
+/Module.markers
+/Module.symvers