Too many open files errors

[lbolla]

Molior logs show these errors:

May 03 03:57:42 molior-prod molior[18481]: socket.accept() out of system resource
                                           socket: <socket.socket fd=11, family=AddressFamily.AF_INET, type=SocketKind
                                           Traceback (most recent call last):
                                             File "/usr/lib/python3.7/asyncio/selector_events.py", line 156, in _accep
                                             File "/usr/lib/python3.7/socket.py", line 212, in accept
                                           OSError: [Errno 24] Too many open files

lsof shows a lot of lines like:

python3 7669 molior 3075w      REG               0,46     2319 4052384115 /var/lib/molior/buildout/147209/build.log (rkansw05-svm05e.kau.roche.com:/molior/molior-data)
python3 7669 molior 3076w      REG               0,46     2629 4051705434 /var/lib/molior/buildout/147193/build.log (rkansw05-svm05e.kau.roche.com:/molior/molior-data)
python3 7669 molior 3077w      REG               0,46     2432 4055518686 /var/lib/molior/buildout/147239/build.log (rkansw05-svm05e.kau.roche.com:/molior/molior-data)
python3 7669 molior 3078w      REG               0,46     2462 4051863571 /var/lib/molior/buildout/147221/build.log (rkansw05-svm05e.kau.roche.com:/molior/molior-data)
python3 7669 molior 3079w      REG               0,46     2331 4052057892 /var/lib/molior/buildout/147207/build.log (rkansw05-svm05e.kau.roche.com:/molior/molior-data)
python3 7669 molior 3080w      REG               0,46     2360 4051851157 /var/lib/molior/buildout/147237/build.log (rkansw05-svm05e.kau.roche.com:/molior/molior-data)
python3 7669 molior 3081w      REG               0,46    38084 4055655080 /var/lib/molior/buildout/147190/build.log (rkansw05-svm05e.kau.roche.com:/molior/molior-data)

suggesting that "build.log" files are not closed properly.

[lbolla]

See pull request #24