Mention htools:migration: and htools:allowmigration: in NEWS
Mention htools:migration: and htools:allowmigration: in NEWS

While it is highly unlikely that those tags have been used in an
existing cluster, it is still an incompatible change that tags
that used to be ignored by Ganeti now get a special meaning.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>

apyrgio/ganeti,andir/ganeti,yiannist/ganeti,ganeti/ganeti,ganeti/ganeti,leshchevds/ganeti,andir/ganeti,yiannist/ganeti,dimara/ganeti,mbakke/ganeti,onponomarev/ganeti,bitemyapp/ganeti,dimara/ganeti,leshchevds/ganeti,apyrgio/ganeti,mbakke/ganeti,andir/ganeti,ganeti/ganeti,grnet/snf-ganeti,onponomarev/ganeti,leshchevds/ganeti,grnet/snf-ganeti,mbakke/ganeti,bitemyapp/ganeti,ganeti-github-testing/ganeti-test-1,ganeti-github-testing/ganeti-test-1,yiannist/ganeti