Update NEWS file
Update NEWS file

This patch updates the NEWS file with NEWS of the bugfix, adding the
new 2.9.4 version in progress.

Signed-off-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

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