Tag 2.0.0-rc1

New features:

• Unified code base for Linux and FreeBSD
• Redacted 'zfs send/recv'
• Persistent L2ARC
• Sequential resilvering
• ZSTD Compression
• Log spacemaps
• Fast clone deletion
• Sectional zfs/zpool man pages
• Added 'zpool wait' subcommand
• Improved 'zfs share' scalability
• Improved AES-GCM encryption performance

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>