Update design doc wrt to queries from non-masters
Update design doc wrt to queries from non-masters

This patch updates the design document of the query
splitting with respect to the proposal of making it
possible to run queries from other nodes than the
master node.

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

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