Fix #911 - close the Rows object

[lars-t-hansen]

No description provided.

[lars-t-hansen]

Appears to be working correctly in testing.

[lars-t-hansen]

But it is insufficient. It starts failing again. Meanwhile, a "load" request for Betzy data appeared (actually two):

Command: /home/sonalyze/sonalyze/<sonalyze> load -cluster=betzy.sigma2.no -from=1d -fmt=json,datetime,cpu,mem,gpu,gpumem,rcpu,rmem,rres,rgpu,rgpumem,gpus,host -none=true -all=true -jobanalyzer-dir /home/sonalyze/sonalyze -database-uri postgresql://naicadmin:naicpw@naic-monitor.uio.no:10102/naicmon
Command: /home/sonalyze/sonalyze/<sonalyze> load -cluster=fox.educloud.no -from=1d -fmt=json,datetime,cpu,mem,gpu,gpumem,rcpu,rmem,rres,rgpu,rgpumem,gpus,host -none=true -all=true -jobanalyzer-dir /home/sonalyze/sonalyze -database-uri postgresql://naicadmin:naicpw@naic-monitor.uio.no:10102/naicmon

Don't know where these came from. It's not obvious that they're lingering (and thus holding resources) but they could be. The error persists.