vouch#54 improve secret origin and validate length

Merge branch 'halkeye-k8s-support'

notice: name has been changed to vouch/vouch-proxy

Merge branch 'halkeye-fix-multiple-accounts'

Merge branch 'halkeye-smaller-docker-image'

Merge branch 'halkeye-add-usage-and-port'

Merge branch 'halkeye-add-healthcheck'

Merge branch 'master' of github.com:LassoProject/lasso

Merge branch 'master' of git.fs.bnf.net:bnfinet/lasso

tell the end user that they're in testing mode