close idle HTTPDownstreamSessions before load shedding
Summary: when any system resource limit is reached, proxygen reduces the number of idle downstream sessions to accomodate new ones. Test Plan: canarying on edge241.01.ams3. Here is the number of idle connection closed during pre load shedding stage. https://www.facebook.com/pxlcld/ml7J Reviewed By: afrind@fb.com Subscribers: alandau, noamler, fugalh, bmatheny, folly-diffs@, jsedgwick, yfeldblum, chalfant, xning, alexkr FB internal diff: D2030988 Tasks: 5698711 Signature: t1:2030988:1431369559:ce7328d51c7fd0afa7e9e5c19b0c66736d01fee1
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