Prepare NEWS file for 2.6.0 rc2
Prepare NEWS file for 2.6.0 rc2

We are about to release another version of Ganeti 2.6, so we prepare the
NEWS file with the changes from rc1 to rc2.

Signed-off-by: René Nussbaumer <bc755ac45a0e799d1d490cba76febc56d80cc5fc@google.com>
Reviewed-by: Agata Murawska <4c8886dbe342c6966e25105100cfee09458faa93@google.com>

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