go.crypto/ssh/test: Only show SSHD debug output if test fails.
go.crypto/ssh/test: Only show SSHD debug output if test fails.

R=agl, dave, jpsugar
CC=golang-dev
https://golang.org/cl/13438043

pki-io/crypto,thomaso-mirodin/crypto,golang/crypto,kim-racktop/crypto,kim-racktop/crypto,cmars/tools,tca/crypto,wooutl/golangcrypto,golang/crypto,pki-io/crypto,ScriptRock/crypto,a-palchikov/crypto,guaiguaihw/crypto,juniorz/crypto,thomaso-mirodin/crypto,wooutl/golangcrypto,guaiguaihw/crypto,bford/golang-x-crypto,Carrotman42/crypto,Carrotman42/crypto,bford/golang-x-crypto,cmars/tools,ScriptRock/crypto,cheffo/crypto,golang/crypto,progrium/crypto,conseweb/golangcrypto,mattharden/crypto,conseweb/golangcrypto,cmars/tools,zj8487/crypto,cheffo/crypto,tca/crypto,CodyGuo/crypto,a-palchikov/crypto,cmars/tools,juniorz/crypto,mattharden/crypto,CodyGuo/crypto,lucevers/crypto,lucevers/crypto,zj8487/crypto,progrium/crypto