Update cpu counters correctly after pinst changes
Update cpu counters correctly after pinst changes

The cpu counters are update on primary instance adds/removes.

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