jqueue: Log progress and load jobs one by one
jqueue: Log progress and load jobs one by one

By logging more information, a user can see how far it is in inspecting
the queue. This can be useful with a large number of jobs. Also, instead
of loading all jobs in one go, load only the list of job IDs and then
load jobs one by one.

Reviewed-by: ultrotter


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