authenticate: remove extra login page (#34)

- Fixed a bug where Lifetime TTL was set to a minute.
- Remove nested mux in authenticate handlers.
- Remove extra ping endpoint in authenticate and proxy.
- Simplified sign in flow with multi-catch case statement.
- Removed debugging logging.
- Broke out cmd/pomerium options into own file.
- Renamed msicreant cipher to just cipher.

Closes #23

cmd/pomerium/main_test.go

@@ -1,63 +0,0 @@
-package main // import "github.com/pomerium/pomerium/cmd/pomerium"
-
-import (
-	"os"
-	"reflect"
-	"testing"
-)
-
-func init() {
-	os.Clearenv()
-}
-func Test_optionsFromEnvConfig(t *testing.T) {
-	tests := []struct {
-		name     string
-		want     *Options
-		envKey   string
-		envValue string
-		wantErr  bool
-	}{
-		{"good default with no env settings", defaultOptions, "", "", false},
-		{"good service", defaultOptions, "SERVICES", "all", false},
-		{"invalid service type", nil, "SERVICES", "invalid", true},
-		{"bad debug boolean", nil, "POMERIUM_DEBUG", "yes", true},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if tt.envKey != "" {
-				os.Setenv(tt.envKey, tt.envValue)
-				defer os.Unsetenv(tt.envKey)
-			}
-			got, err := optionsFromEnvConfig()
-			if (err != nil) != tt.wantErr {
-				t.Errorf("optionsFromEnvConfig() error = %v, wantErr %v", err, tt.wantErr)
-				return
-			}
-			if !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("optionsFromEnvConfig() = got %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func Test_isValidService(t *testing.T) {
-	tests := []struct {
-		name    string
-		service string
-		want    bool
-	}{
-		{"proxy", "proxy", true},
-		{"all", "all", true},
-		{"authenticate", "authenticate", true},
-		{"authenticate bad case", "AuThenticate", false},
-		{"authorize not yet implemented", "authorize", false},
-		{"jiberish", "xd23", false},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := isValidService(tt.service); got != tt.want {
-				t.Errorf("isValidService() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}