Make ipolicy violations a warning
Make ipolicy violations a warning

So far, when running 'gnt-cluster verify' on a cluster which
has instances that violate the instance policy, those
violations were shown as an error. This patch makes them a
warning.

Signed-off-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>
Reviewed-by: Iustin Pop <deb4b1361f5b1c49f387a83f3ec0e08f1c2c93e8@google.com>

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