Don't ignore SIGPIPE

By default Python configures SIGPIPE to be SIG_IGN, which means to
ignore the signal. We don't want that as it causes problems when
journald restarts and our log calls start triggering SIGPIPEs.
Instead, we want to allow the SIGPIPE to kill the process so it can
be restarted by systemd.

Change-Id: I512139b96b2de8b372efc91e8a3fc8d33553405a
Closes-Bug: 1795030

os_collect_config/collect.py

@@ -241,6 +241,9 @@ def getfilehash(files):
 
 def __main__(args=sys.argv, collector_kwargs_map=None):
     signal.signal(signal.SIGHUP, reexec_self)
+    # NOTE(bnemec): We need to exit on SIGPIPEs so systemd can restart us.
+    #               See lp 1795030
+    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
     setup_conf()
     CONF(args=args[1:], prog="os-collect-config",
          version=version.version_info.version_string())