Crash using auth = "none" in service configuration for osctrl-admin

[javuto]

Issue

Using osctrl v0.1.5, using auth = "none" in the service configuration (admin.json) for osctrl-admin, when attempting to browse the admin UI, server throws a panic and browser shows a nginx 502 Bad Gateway error.

Steps to reproduce

1 - Deploy locally, using vagrant up for example,
2 - Change auth = "db" for auth = "none" in /opt/osctrl/config/admin.json
3 - Run make install to rebuild and deploy.
4 - Crash, panic and nginx 502 Bad Gateway. Also this stacktrace:

Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: server.go:3012: http: panic serving 127.0.0.1:41128: interface conversion: interface {} is nil, not main.contextValue
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: goroutine 690 [running]:
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: net/http.(*conn).serve.func1(0xc000083cc0)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /usr/local/go/src/net/http/server.go:1769 +0x139
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: panic(0xa3a900, 0xc000341980)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /usr/local/go/src/runtime/panic.go:522 +0x1b5
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: main.environmentHandler(0xbcf240, 0xc0001bc700, 0xc000176400)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /vagrant/cmd/admin/handlers-get.go:121 +0xec6
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: net/http.HandlerFunc.ServeHTTP(0xb01fd0, 0xbcf240, 0xc0001bc700, 0xc000176400)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /usr/local/go/src/net/http/server.go:1995 +0x44
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: main.handlerAuthCheck.func1(0xbcf240, 0xc0001bc700, 0xc000176400)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /vagrant/cmd/admin/auth.go:17 +0xc2
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: net/http.HandlerFunc.ServeHTTP(0xc0003c3dc0, 0xbcf240, 0xc0001bc700, 0xc000176400)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /usr/local/go/src/net/http/server.go:1995 +0x44
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: github.com/gorilla/mux.(*Router).ServeHTTP(0xc0000de9c0, 0xbcf240, 0xc0001bc700, 0xc000176200)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /home/vagrant/go/pkg/mod/github.com/gorilla/mux@v1.7.2/mux.go:212 +0xe3
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: net/http.serverHandler.ServeHTTP(0xc0004c3c70, 0xbcf240, 0xc0001bc700, 0xc000176200)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /usr/local/go/src/net/http/server.go:2774 +0xa8
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: net/http.(*conn).serve(0xc000083cc0, 0xbd0b40, 0xc0001790c0)
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /usr/local/go/src/net/http/server.go:1878 +0x851
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]: created by net/http.(*Server).Serve
Aug 27 22:56:12 osctrl-Dev osctrl-admin[21166]:         /usr/local/go/src/net/http/server.go:2884 +0x2f4

[javuto]

Fixed in #5