QA: test renewing the cluster certificate only
QA: test renewing the cluster certificate only

Currently, there is not test for just running renew-crypto
to only renew the cluster certificate (and not the node
certificates). This patches adds the test.

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

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