Bug#1031765: pgrep: signal handler matching breaks argument parsing

Upstream has merged https://github.com/ganeti/ganeti/pull/1692, commit 9cd67e6a81c6 ("uidpool_unittest: avoid using negative UIDs") to solve the issue. Additionally the following patch is needed to fix a separate problem with testing: a40748ab26fc ("py-tests: make tests compatible with roman

Bug#1031765: pgrep: signal handler matching breaks argument parsing

Upstream bug report created: https://github.com/ganeti/ganeti/issues/1691 Ubuntu bug LP #2009498