Viper (set config via flags, config file, and environ vars) (#1857)

* Port over "common" flags to viper

* Switch bulk over to viper

* Fix compile error

* Port over live

* Revert part of rename -- will look at later

* Zero

* Server

* Ignore pflag.ErrHelp when pre-parsing the flags

* WIP for some debugging

* Revert "WIP for some debugging"

This reverts commit e5dbc66fe9ab62097b05287c58ed4d31557fe1bf.

* Load config file during OnInitialize callback

* Change where flags are bound

* Remove unused field in Options struct

* Get everything compiling again

* Add vendors

* More vendor

* Even more vendors (??)

* Get profiling working

* Add missing x/profile.go

* Check for extra args for all subcommands

* Better way to prevent additional args

* Make tls settings consistent

* Clean up args a bit

* Fix for uiDir

* Remove dummy conf file

* Use explicit "stopper" interface

* Search and replace for tls. -> tls_

* Fix broken flags for certs

* Update docos for configuration

* Add to changelog

* Skip failing out for tlstest for mac