handle redis failure on forking reconnect
handle redis failure on forking reconnect

test plan: run canvas through passenger and give it a bad IP for the
redis box, verify it can spin up new processes

Change-Id: I7d847da1c290261f89cbf2d792c875eefd20fe2c
Reviewed-on: https://gerrit.instructure.com/10551
Reviewed-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>

snehakachroo1/LSI_replica,utkarshx/canvas-lms,parbros/red-innovadores-lms,loganrun/pincan,snehakachroo1/LSI_replica,wrdsb/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,skmezanul/canvas-lms,Unow/ins,merichar/canvas-lms,landonwilkins/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,kyroskoh/canvas-lms,arrivu/hoodemo,narigone/canvas,gbleydon/canvas-lms,matematikk-mooc/canvas-lms,merichar/canvas-lms,gbleydon/canvas-lms,sdeleon28/canvas-lms,antoniuslin/canvas-lms,tgroshon/canvas-lms,ShreniiNepal/shrenii_lmp,grahamb/canvas-lms,skmezanul/canvas-lms,nditech/red-innovadores-lms,HotChalk/canvas-lms,djbender/canvas-lms,jay3126/canvas-lms,efrj/canvas-lms,instructure/canvas-lms,loganrun/pincan,eCNAP/CANVAS,venturehive/canvas-lms,sfu/canvas-lms,Rvor/canvas-lms,shidao-fm/canvas-lms,icelab/canvas,wimemx/Canvas,arrivu/jigsaw-lms,fronteerio/canvas-lms,SwinburneOnline/canvas-lms,sli7246/canvas_branch,roxolan/canvas-lms,landonwilkins/canvas-lms,Rvor/canvas-lms,efrj/canvas-lms,va7map/canvas-lms,wimemx/Canvas,usmschuck/canvas,arrivu/hiring-site,HotChalk/canvas-lms,nditech/red-innovadores-lms,jay3126/canvas-lms,efrj/canvas-lms,samuels410/greatlakes-lms,leftplusrightllc/canvas-lms,antoniuslin/canvas-lms,snehakachroo1/LSI_replica,dgynn/canvas-lms,landonwilkins/canvas-lms,sli7246/canvas_branch,venturehive/canvas-lms,landonwilkins/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,eCNAP/CANVAS,skmezanul/canvas-lms,samuels410/greatlakes-lms,AndranikMarkosyan/lms,instructure/canvas-lms,icelab/canvas,kyroskoh/canvas-lms,dgynn/canvas-lms,gbleydon/canvas-lms,usmschuck/canvas,arrivu/jigsaw-lms,wye0220/shindig-canvas,snehakachroo1/LSI_replica,dgynn/canvas-lms,shidao-fm/canvas-lms,tgroshon/canvas-lms,usmschuck/canvas,SwinburneOnline/canvas-lms,grahamb/canvas-lms,wimemx/Canvas,parbros/red-innovadores-lms,usmschuck/canvas,wye0220/shindig-canvas,va7map/canvas-lms,HotChalk/canvas-lms,utkarshx/canvas-lms,matematikk-mooc/canvas-lms,rup/Tarrax,roxolan/canvas-lms,wye0220/shindig-canvas,arrivu/jigsaw-lms,sdeleon28/canvas-lms,dgynn/canvas-lms,Jyaasa/canvas-lms,eCNAP/CANVAS,tgroshon/canvas-lms,shidao-fm/canvas-lms,utkarshx/canvas-lms,SwinburneOnline/canvas-lms,juoni/canvas-lms,arrivu/hoodemo,ankithbti/canvas_lms,tgroshon/canvas-lms,AndranikMarkosyan/lms,arrivu/hiring-site,Jyaasa/canvas-lms,Unow/canvas-lms,jay3126/canvas-lms,ankithbti/canvas_lms,nditech/red-innovadores-lms,leftplusrightllc/canvas-lms,sfu/canvas-lms,juoni/canvas-lms,juoni/canvas-lms,djbender/canvas-lms,arrivu/arrivu-lms,nditech/red-innovadores-lms,antoniuslin/canvas-lms,samuels410/greatlakes-lms,Rvor/canvas-lms,utkarshx/canvas-lms,Jyaasa/canvas-lms,Jyaasa/canvas-lms,narigone/canvas,whalejasmine/canvas-lms,grahamb/canvas-lms,redconfetti/canvas-lms,redconfetti/canvas-lms,Unow/canvas-lms,wrdsb/canvas-lms,arrivu/arrivu-lms,antoniuslin/canvas-lms,samuels410/greatlakes-lms,fronteerio/canvas-lms,HotChalk/canvas-lms,arrivu/qibla-ecampus,matematikk-mooc/canvas-lms,whalejasmine/canvas-lms,greyhwndz/canvas-lms,redconfetti/canvas-lms,jay3126/canvas-lms,leftplusrightllc/canvas-lms,ShreniiNepal/shrenii_lmp,rup/Tarrax,wrdsb/canvas-lms,greyhwndz/canvas-lms,roxolan/canvas-lms,SwinburneOnline/canvas-lms,narigone/canvas,arrivu/qibla-ecampus,whalejasmine/canvas-lms,greyhwndz/canvas-lms,instructure/canvas-lms,ankithbti/canvas_lms,sfu/canvas-lms,djbender/canvas-lms,fronteerio/canvas-lms,icelab/canvas,redconfetti/canvas-lms,ShreniiNepal/shrenii_lmp,skmezanul/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,arrivu/hiring-site,eCNAP/CANVAS,ShreniiNepal/shrenii_lmp,va7map/canvas-lms,sdeleon28/canvas-lms,instructure/canvas-lms,arrivu/hoodemo,whalejasmine/canvas-lms,roxolan/canvas-lms,kyroskoh/canvas-lms,sdeleon28/canvas-lms,loganrun/pincan,sfu/canvas-lms,grahamb/canvas-lms,kyroskoh/canvas-lms,greyhwndz/canvas-lms,Unow/ins,Unow/canvas-lms,instructure/canvas-lms,sli7246/canvas_branch,wrdsb/canvas-lms,fronteerio/canvas-lms,juoni/canvas-lms,leftplusrightllc/canvas-lms,Unow/ins,rup/Tarrax,va7map/canvas-lms,arrivu/arrivu-lms,efrj/canvas-lms,narigone/canvas,merichar/canvas-lms,shidao-fm/canvas-lms,djbender/canvas-lms,Rvor/canvas-lms,arrivu/qibla-ecampus,AndranikMarkosyan/lms,parbros/red-innovadores-lms,AndranikMarkosyan/lms,venturehive/canvas-lms