Display helpful message when cf crashes
Display helpful message when cf crashes

[finishes #64011004]

Signed-off-by: Tim Jarratt <214050fdd5ef63ef47b1889310e3f343becc2c55@pivotallabs.com>

cf-routing/cli,xingzhou/cli,fujitsu-cf/cli,SrinivasChilveri/cli,nttlabs/cli,srikanth88infy/cli,zhang-hua/cli,cgvarela/cli,saravana76/cli,saurabhguptasg/cli,nimbus-cloud/cli,markstgodard/cli,xingzhou/cli,kavoj/cli,saravana76/cli,18F/cli,ReachingOut/cli,hyenaspots/cli,srikanth88infy/cli,cgvarela/cli,Zouuup/cli,ReachingOut/cli,rastasheep/trash-can,ofer43211/cli,pishro-cc/cli,mcowger/cli,HuaweiTech/cli,cf-routing/cli,ofer43211/cli,carnell69/cli,srikanth88infy/cli,TomG713/cli,nttlabs/cli,Zouuup/cli,diatmpravin/cli,cgvarela/cli,evanfarrar/cli,mcowger/cli,evanfarrar/cli,18F/cli,TomG713/cli,diatmpravin/cli,ReachingOut/cli,mcintyred/cli,saravana76/cli,diatmpravin/cli,zhang-hua/cli,AmitRoushan/cli,rastasheep/trash-can,mcintyred/cli,kavoj/cli,xingzhou/cli,zhang-hua/cli,nimbus-cloud/cli,HuaweiTech/cli,carnell69/cli,rastasheep/trash-can,nttlabs/cli,simonleung8/cli,markstgodard/cli,SrinivasChilveri/cli,SrinivasChilveri/cli,mcowger/cli,pishro-cc/cli,kavoj/cli,mcowger/cli,fujitsu-cf/cli,carnell69/cli,saravana76/cli,hyenaspots/cli,AmitRoushan/cli,mcintyred/cli,rastasheep/trash-can,EngineerBetter/cli,srikanth88infy/cli,AmitRoushan/cli,pishro-cc/cli,Zouuup/cli,cf-routing/cli,diatmpravin/cli,TomG713/cli,TomG713/cli,ofer43211/cli,saurabhguptasg/cli,18F/cli,18F/cli,saurabhguptasg/cli,nttlabs/cli,ofer43211/cli,zhang-hua/cli,Zouuup/cli,markstgodard/cli,EngineerBetter/cli,HuaweiTech/cli,saurabhguptasg/cli,evanfarrar/cli,ReachingOut/cli,hyenaspots/cli,mcintyred/cli,HuaweiTech/cli,kavoj/cli,AmitRoushan/cli,pishro-cc/cli,EngineerBetter/cli,carnell69/cli,EngineerBetter/cli,simonleung8/cli,markstgodard/cli,fujitsu-cf/cli,evanfarrar/cli,SrinivasChilveri/cli,nimbus-cloud/cli,cf-routing/cli,cgvarela/cli,xingzhou/cli,hyenaspots/cli,simonleung8/cli