Close a race that demonstrates that I have no idea what kind of load my users have:
Close a race that demonstrates that I have no idea what kind of load
my users have:

Do not load new segments opened after we started, even if multiple such
have been created, before we finish loading the old segments from the
silo.

Fixes	#564




git-svn-id: 7d4b18ab7d176792635d6a7a77dd8cbbea8e8daa@4355 d4fa192b-c00b-0410-8231-f00ffab90ce4

ssm/pkg-varnish,wikimedia/operations-debs-varnish,CartoDB/Varnish-Cache,CartoDB/Varnish-Cache,ssm/pkg-varnish,ssm/pkg-varnish,ssm/pkg-varnish,wikimedia/operations-debs-varnish,wikimedia/operations-debs-varnish,CartoDB/Varnish-Cache,wikimedia/operations-debs-varnish,ssm/pkg-varnish,wikimedia/operations-debs-varnish