update net-ldap gem fixes #3500
update net-ldap gem fixes #3500

test plan:
 * set up an LDAP search filter like
 (&(!(userAccountControl:1.2.840.113556.1.4.803:=2))(sAMAccountName={{login}}))
   and ensure you don't get a page error trying to log in

Change-Id: I7b431783f646cbdaf2b1c78778a05224e9c88183
Reviewed-on: https://gerrit.instructure.com/12913
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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