hail: add '-p' option intended for debugging use
hail: add '-p' option intended for debugging use

This prints the initial node list on stderr, since stdout is reserved for the
iallocator protocol (even though ganeti won't pass -p itself).

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