Merge branch 'tipc-encryption' into next

Tuong Lien  says:

====================

This series adds two new options in the 'iproute2/tipc' command, enabling users
to use the new TIPC encryption features, i.e. the master key and rekeying which
have been recently merged in kernel.

The help menu of the "tipc node set key" command is also updated accordingly:

 # tipc node set key --help
Usage: tipc node set key KEY [algname ALGNAME] [PROPERTIES]
       tipc node set key rekeying REKEYING

KEY
  Symmetric KEY & SALT as a composite ASCII or hex string (0x...) in form:
  [KEY: 16, 24 or 32 octets][SALT: 4 octets]

ALGNAME
  Cipher algorithm [default: "gcm(aes)"]

PROPERTIES
  master                - Set KEY as a cluster master key
  <empty>               - Set KEY as a cluster key
  nodeid NODEID         - Set KEY as a per-node key for own or peer

REKEYING
  INTERVAL              - Set rekeying interval (in minutes) [0: disable]
  now                   - Trigger one (first) rekeying immediately

EXAMPLES
  tipc node set key this_is_a_master_key master
  tipc node set key 0x746869735F69735F615F6B657931365F73616C74
  tipc node set key this_is_a_key16_salt algname "gcm(aes)" nodeid 1001002
  tipc node set key rekeying 600

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Signed-off-by: David Ahern <dsahern@gmail.com>