Prepare NEWS for 2.14.0 release
Prepare NEWS for 2.14.0 release

Set the release date and describe the fixes since the last release candidate.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

ganeti/ganeti,yiannist/ganeti,leshchevds/ganeti,bitemyapp/ganeti,mbakke/ganeti,leshchevds/ganeti,yiannist/ganeti,leshchevds/ganeti,grnet/snf-ganeti,onponomarev/ganeti,yiannist/ganeti,ganeti/ganeti,mbakke/ganeti,onponomarev/ganeti,andir/ganeti,ganeti/ganeti,andir/ganeti,mbakke/ganeti,andir/ganeti,bitemyapp/ganeti,grnet/snf-ganeti