Sort instance data in gnt-node info
Sort instance data in gnt-node info

The patch sorts the instance list in gnt-node info output, in order to
make it more readable (and stable).

Reviewed-by: imsnah

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