HEADS-UP: OpenSSH DSA keys are deprecated in 12.0 and 11.0

[Glen Barber]

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This is a heads-up that OpenSSH keys are deprecated upstream by OpenSSH,
and will be deprecated effective 11.0-RELEASE (and preceeding RCs).

Please see r303716 for details on the relevant commit, but upstream no
longer considers them secure.  Please replace DSA keys with ECDSA or RSA
keys as soon as possible, otherwise there will be issues when upgrading
from 11.0-BETA4 to the subsequent 11.0 build, but most definitely the
11.0-RELEASE build.

Glen
On behalf of:	re@ and secteam@

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