merge with onnv_147
Reviewed by: garrett@nexenta.com
Approved by: garrett@nexenta.com

6967788 Allow zlook to use smaller buffers for ease of debugging

6846421 zlook doesn't build with real gcc

PSARC 2009/246 ZFS support for Access Based Enumeration
6802734 Support for Access Based Enumeration
6826760 A test driver for some ZFS features would be beneficial
6844861 inconsistent xattr readdir

PSARC 2009/246 ZFS support for Access Based Enumeration
6802734 Support for Access Based Enumeration
6826760 A test driver for some ZFS features would be beneficial
6844861 inconsistent xattr readdir behavior with too-small buffer

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